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inquiryItems Standard Result Appearance Almost white or light yellow powder Almost white powder Solubility
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inquiryProduct description: Product name 6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one CAS number 43200-81-3 Assay ≥98% Appearance Yellow crystalline powder Capacity
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inquiry6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one Basic information Product Name: 6-(5-Chlor
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inquiry6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one CAS:43200-81-3 Qingdao Belugas Import and Export Co., Ltd. is a scientific and technological company integrating research and development, production and trade of chemical
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inquiryHello, dear friend! I'm Hansen and Allen from China. Welcome to my lookchem mall! The following is a brief introduction of our company's products and services. If you are interested in our products, please contact us by emai
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inquiry6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one CAS: 43200-81-3 Specificatio Product name 6-(5-Chloro-2-pyridyl)-6,7-dihydro-7-hydroxy-5H-pyrrolo[3,4-b]pyrazin-5-one CAS number 43200-81-3
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inquiryHenan Wentao Chemical Product Co.,Ltd is Located in Zhengzhou High-tech Development Zone with import and export license, We passed ISO 9001:2008 as well, Henan Wentao has developed more than 1000 compounds, which are widely used in the fields of prod
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inquirySuperior quality, moderate price & quick delivery. Appearance:Yellow Crystalline Powder Storage:Stored in cool, dry and ventilation place; Away from fire and heat Package:as per your request Application:Eszopiclone intermediate Transportation:a
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inquiry6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With sulfuric acid In ethanol for 3h; Reflux; | 88.7% |
6-(5-chloro-2-pyridyl)-5,7-dioxo-6,7-dihydro-5H-pyrrolo(3,4-b)pyrazine
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Stage #1: 6-(5-chloro-2-pyridyl)-5,7-dioxo-6,7-dihydro-5H-pyrrolo(3,4-b)pyrazine With potassium borohydride In 1,4-dioxane at 10 - 15℃; for 0.5h; Stage #2: With water In 1,4-dioxane for 6h; | 87.4% |
With potassium borohydride; water In tetrahydrofuran at -10 - 5℃; for 3h; Large scale; | 70% |
With potassium borohydride; potassium carbonate In 1,4-dioxane; water; N,N-dimethyl-formamide at 13℃; pH=11; Reagent/catalyst; Solvent; pH-value; | 95.5 g |
With sodium hydroxide; sodium tetrahydroborate In water at 0 - 5℃; for 4 - 5h; Product distribution / selectivity; |
(-)-Zopiclone
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Stage #1: (-)-Zopiclone With trifluoroacetic acid In dichloromethane for 18h; Heating / reflux; Stage #2: With water; sodium hydrogencarbonate In dichloromethane at 0℃; pH=7.5 - 8; Product distribution / selectivity; | 70% |
Stage #1: (-)-Zopiclone With trifluoroacetic acid In dichloromethane for 18h; Heating / reflux; Stage #2: With sodium hydrogencarbonate In dichloromethane; water at 0℃; pH=7.5 - 8; Product distribution / selectivity; | 70% |
Stage #1: (-)-Zopiclone With hydrogenchloride; water In methanol at 41℃; for 11h; Stage #2: With sodium hydrogencarbonate In methanol; water at 10 - 15℃; Product distribution / selectivity; | 41.24% |
Stage #1: (-)-Zopiclone With hydrogenchloride; water In methanol at 41℃; for 11h; Stage #2: With sodium hydrogencarbonate In methanol; water at 10 - 15℃; Product distribution / selectivity; | 41.24% |
With hydrogenchloride; water at 70℃; for 3h; |
(+/-)-7-(2-chloromethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
A
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
B
(S)-(+)-7-(2-chloromethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With phosphate buffer; Candida antarctica lipase B Chirazyme-L2; triethylamine In water; toluene at 60℃; for 96h; pH=7; |
(+/-)-7-(2-chloroethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
A
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
B
(S)-(+)-7-(2-chloroethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With phosphate buffer; Candida antarctica lipase B Novozym 435 In water; toluene at 60℃; for 96h; pH=7; |
(R)-6-(5-chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4b]pyrazin-5-yl 4-methylpiperazine-1-carboxylate D-(+)-O,O'-dibenzoyltartaric acid salt
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Stage #1: (R)-6-(5-chloropyridin-2-yl)-7-oxo-6,7-dihydro-5H-pyrrolo[3,4b]pyrazin-5-yl 4-methylpiperazine-1-carboxylate D-(+)-O,O'-dibenzoyltartaric acid salt With water; sodium hydrogencarbonate In dichloromethane; acetonitrile at 25 - 30℃; for 0.75h; Stage #2: With hydrogenchloride; formic acid; water at 0 - 68℃; for 4h; Product distribution / selectivity; |
(+/-)-7-(2-chloromethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
A
(R)-5-(chloromethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-7-oxo-5,6-dihydropyrrolo[3,4-b]pyrazine
B
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
C
(S)-(+)-7-(2-chloromethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With propan-1-ol; triethylamine; Novozyme 435 In toluene at 45℃; for 16 - 24h; Purification / work up; Enzymatic reaction; Resolution of racemate; | A n/a B n/a C n/a |
2,3-pyrazinedicarboxylic anhydride
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1.1: dmap; triethylamine / 5,5-dimethyl-1,3-cyclohexadiene / 13 h / 0 °C / Reflux 2.1: potassium borohydride / 1,4-dioxane / 0.5 h / 10 - 15 °C 2.2: 6 h View Scheme | |
Multi-step reaction with 3 steps 1.1: toluene / 2.5 h / 20 - 52 °C 1.2: 1 h / 10 - 15 °C 2.1: dichloromethane / 1 h / Heating / reflux 2.2: 0.75 - 1 h / 25 - 30 °C / Heating / reflux 3.1: sodium hydroxide; sodium tetrahydroborate / water / 4 - 5 h / 0 - 5 °C View Scheme | |
Multi-step reaction with 2 steps 1: propionic acid anhydride / 1 h / 60 - 105 °C 2: potassium borohydride; water / tetrahydrofuran / 3 h / -10 - 5 °C / Large scale View Scheme |
5-chloro-2-pyridylamine
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1.1: dmap; triethylamine / 5,5-dimethyl-1,3-cyclohexadiene / 13 h / 0 °C / Reflux 2.1: potassium borohydride / 1,4-dioxane / 0.5 h / 10 - 15 °C 2.2: 6 h View Scheme | |
Multi-step reaction with 3 steps 1.1: toluene / 2.5 h / 20 - 52 °C 1.2: 1 h / 10 - 15 °C 2.1: dichloromethane / 1 h / Heating / reflux 2.2: 0.75 - 1 h / 25 - 30 °C / Heating / reflux 3.1: sodium hydroxide; sodium tetrahydroborate / water / 4 - 5 h / 0 - 5 °C View Scheme | |
Multi-step reaction with 3 steps 1: isopropyl alcohol / 5 h / Reflux; Large scale 2: 1 h / Reflux; Large scale 3: sulfuric acid / ethanol / 3 h / Reflux View Scheme | |
Multi-step reaction with 2 steps 1: propionic acid anhydride / 1 h / 60 - 105 °C 2: potassium borohydride; water / tetrahydrofuran / 3 h / -10 - 5 °C / Large scale View Scheme |
zopiclon
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1.1: water; acetonitrile / 3 - 4.5 h / 25 - 80 °C / Resolution of racemate 2.1: water; sodium hydrogencarbonate / dichloromethane; acetonitrile / 0.75 h / 25 - 30 °C 2.2: 4 h / 0 - 68 °C View Scheme |
3-((5-chloropyridin-2-yl)carbamoyl)pyrazine-2-carboxylic acid
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1.1: dichloromethane / 1 h / Heating / reflux 1.2: 0.75 - 1 h / 25 - 30 °C / Heating / reflux 2.1: sodium hydroxide; sodium tetrahydroborate / water / 4 - 5 h / 0 - 5 °C View Scheme |
2-Chloroethyl chloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
(+/-)-7-(2-chloroethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 25℃; for 7h; | 98% |
With pyridine In dichloromethane at 0 - 20℃; for 7h; | 98% |
With pyridine In dichloromethane at 20℃; for 7h; |
carbonochloridic acid 1-chloro-ethyl ester
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 0 - 20℃; for 4h; | 98% |
With pyridine |
2,2,2-trichloro-1,1-dimethylethoxychloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 0 - 20℃; for 2h; | 98% |
With pyridine |
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
2,2,2-Trichloroethyl chloroformate
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 25℃; for 5h; | 98% |
With pyridine In dichloromethane at 0 - 20℃; for 5h; | 98% |
4-methylpiperazine-1-carbonyl chloride monohydrochloride
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
zopiclon
Conditions | Yield |
---|---|
Stage #1: 4-methylpiperazine-1-carbonyl chloride monohydrochloride With triethylamine In dichloromethane at 5℃; for 0.416667h; Stage #2: dmap In dichloromethane for 0.0166667 - 0.0333333h; Stage #3: 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one In dichloromethane at 20℃; for 7h; Product distribution / selectivity; Heating / reflux; | 95% |
With triethylamine; dmap In 2-methylpropyl acetate at 80℃; for 5.5h; Product distribution / selectivity; | 91.7% |
Stage #1: 4-methylpiperazine-1-carbonyl chloride monohydrochloride With triethylamine In ethyl acetate for 0.166667h; Stage #2: 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one; dmap In ethyl acetate at 60℃; for 7.5h; Product distribution / selectivity; | 90% |
Isopropenyl chloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
6-(5-chloropyridin-2-yl)-7-oxo-5-(2-propenyloxycarbonyloxy)-5,6-dihydropyrrolo[3,4b]pyrazine
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 0 - 20℃; for 6h; | 93% |
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With diisobutylaluminium hydride In toluene at -15℃; for 2h; Temperature; | 92.6% |
benzoyl chloride
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 25℃; for 4h; | 89% |
butyryl chloride
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 25℃; for 5h; | 87% |
carbonochloridic acid, chloromethyl ester
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
(+/-)-7-(2-chloromethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 20℃; for 17h; | 86% |
With pyridine In dichloromethane at 25℃; for 17h; | 86% |
With pyridine In dichloromethane at 0 - 20℃; for 17h; | 86% |
acetyl chloride
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 25℃; for 5h; | 85% |
4-methyl-piperazine-1-carbonyl chloride
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
zopiclon
Conditions | Yield |
---|---|
With dmap; triethylamine In dichloromethane at 20℃; for 3h; Reflux; | 80% |
With dmap; triethylamine In acetonitrile at 60 - 65℃; for 1.5h; Large scale; | 80.9% |
Stage #1: 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one With sodium hydride In N,N-dimethyl-formamide; mineral oil at -10 - 35℃; Stage #2: 4-methyl-piperazine-1-carbonyl chloride In N,N-dimethyl-formamide; mineral oil at -10 - 20℃; Product distribution / selectivity; | 78.81% |
Stage #1: 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one With sodium hydride In N,N-dimethyl-formamide at -10℃; Stage #2: 4-methyl-piperazine-1-carbonyl chloride In N,N-dimethyl-formamide at -10 - 20℃; for 3h; Product distribution / selectivity; | 78.81% |
With sodium hydride In N,N-dimethyl-formamide Product distribution / selectivity; |
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
3-hydroxymethyl-pyrazine-2-carboxylic acid N-(5-chloro-pyridin-2-yl)-amide
Conditions | Yield |
---|---|
With sodium tetrahydroborate In 1,4-dioxane; water at 10 - 15℃; for 2h; | 75.2% |
Vinyl chloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
(+/-)-6-(5-chloropyridin-2-yl)-7-oxo-5-(vinyloxycarbonyloxy)-5,6-dihydropyrrolo[3,4b]pyrazine
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 25℃; for 10h; | 75% |
4-Nitrophenyl chloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine In dichloromethane at 0 - 20℃; for 21h; | 55% |
With pyridine |
di(succinimido) carbonate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine; triethylamine In acetonitrile at 0 - 20℃; for 18h; | 40% |
phenyl chloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With (R)-6-benzyl-2,3,5,6-tetrahydroimidazo[2,1-b]thiazole; triethylamine In dichloromethane at 20℃; Catalytic behavior; enantioselective reaction; | 35% |
2-nitrophenyl chloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
With pyridine |
carbonochloridic acid, chloromethyl ester
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
A
(S)-(+)-7-(2-chloromethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Stage #1: carbonochloridic acid, chloromethyl ester; 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one With pyridine In dichloromethane at 25℃; for 17h; Stage #2: With Candida antarctica lipase (fraction B) - octadecyl-Sepabeads; sodium phosphate In 1,4-dioxane; water at 25℃; pH=7; |
2-Chloroethyl chloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
A
(S)-(+)-7-(2-chloroethyloxycarbonyloxy)-6-(5-chloropyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Stage #1: 2-Chloroethyl chloroformate; 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one With pyridine In dichloromethane at 25℃; for 7h; Stage #2: With Candida antarctica lipase (fraction B) - octadecyl-Sepabeads; sodium phosphate In 1,4-dioxane; water at 25℃; pH=7; |
acetyl chloride
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Stage #1: acetyl chloride; 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one With pyridine In dichloromethane at 25℃; for 5h; Stage #2: With Candida antarctica lipase (fraction B) - octadecyl-Sepabeads; sodium phosphate In 1,4-dioxane; water at 37℃; pH=7; |
butyryl chloride
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Stage #1: butyryl chloride; 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one With pyridine In dichloromethane at 25℃; for 5h; Stage #2: With Candida antarctica lipase (fraction B) - octadecyl-Sepabeads; sodium phosphate In 1,4-dioxane; water at 25℃; pH=7; Title compound not separated from byproducts; |
Vinyl chloroformate
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
Conditions | Yield |
---|---|
Stage #1: Vinyl chloroformate; 6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one With pyridine In dichloromethane at 25℃; for 10h; Stage #2: With Candida antarctica lipase (fraction B) - octadecyl-Sepabeads; sodium phosphate In 1,4-dioxane; water at 25℃; pH=7; |
6-(5-chloropyridin-2-yl)-7-hydroxy-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazin-5-one
eszopiclone
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1: 86 percent / pyridine / CH2Cl2 / 17 h / 20 °C 2: Candida antarctica lipase B Chirazyme-L2; phosphate buffer; triethylamine / toluene; H2O / 96 h / 60 °C / pH 7 3: 90 percent / acetone / 0 - 20 °C View Scheme | |
Multi-step reaction with 2 steps 1: (R)-6-tert-butyl-2,3,5,6-tetrahydroimidazo[2,1-b]thiazole; triethylamine / dichloromethane / 0 °C 2: acetonitrile / 2 h / 20 °C View Scheme | |
Multi-step reaction with 3 steps 1: dmap; calcium oxide / dichloromethane; N,N-dimethyl-formamide / 10 - 30 °C 2: water; acetonitrile / 3 - 4.5 h / 25 - 80 °C / Resolution of racemate 3: water; sodium hydrogencarbonate / 3 - 4 h / 25 - 30 °C View Scheme |
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