As a leading manufacturer and supplier of chemicals in China, DayangChem not only supply popular chemicals, but also DayangChem's R&D center offer custom synthesis services. DayangChem can provide different quantities of custom synthesis ch
Cas:555-30-6
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inquiryItems Standard Result Appearance White to yellowish-white, fine powder Conform Solubility
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inquiryXi’an Quanao Biotech Co., Ltd. with 18 years experience in plant extract filed. Product grade: Medicine, Health care product, Cosmetics, Food, Beverage, Feed. Hot selling market: Europe, North America, South America, Middle East, Asia Pacifi
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inquiryThe above product is Ality Chemical's strong item with best price, good quality and fast supply. Ality Chemical has been focusing on the research and production of this field for over 14 years. At the same time, we are always committed to providi
We can provide GMP validation service that complies with SFDA, FDA, WHO and EU EMPA.Excellent registration team could help us easlily to register our products in different countries.If you and your customer are interested in some products or need C
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inquiryColorcom is a global leader in industrial chemical manufacturing and is continuously innovating and transforming to exceed client expectations and industry standards. Colorcom prides itself on superior customer and technical focus, while focusing on
Why is SINOWAY: 1) Specialized in pharmaceutical and healthcare industrial for 34 years. 2) ISO 9001:2015 & SGS audited supplier . 3) Accept various payment terms : T.T 30-60 days. 4) We have warehouse in USA with quickly shipment . 5) We c
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inquiryOur company was built in 2009 with an ISO certificate.In the past 5 years, we have grown up as a famous fine chemicals supplier in China and we had established stable business relationships with Samsung,LG,Merck,Thermo Fisher Scientific and so on.O
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inquiryOur Advantage Rich Experience Our products are sold all over Europe,North&South America, Sino-East, Asia and pacific area as well as Africa,we establish long term. Quality service Company cooperates with research institutes. We strictly con
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inquiryWITH US,YOUR MONEY IN SAFE,YOUR BUSINESS IN SAFE 1)Quick Response Within 12 hours; 2)Quality Guarantee: All products are strictly tested by our QC, confirmed by QA and approved by third party lab in China, USA, Canada, Germany, UK, Italy, France et
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inquiry1. Product advantages ♦ High purity, all above 98.5%, no impurities after dissolution ♦ We will test each batch to ensure quality ♦ OEM and private brand services designed for free ♦ Various cap colors available ♦ W
Cas:555-30-6
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inquiryName: Methyldopa CAS: 555-30-6 MF: C10H13NO4 Appearance:White Powder Storage:Store in cool and dry place, away from sun light. Package:25kg Application:APIS Transportation:By sea or by air Port:Qingdao Port
Our Adwantage: 1.We have stock so we can delivery quickly at the very day when receive the payment. 2.Best price, first class service, high successful delivery rate. A discount would be given when you make a large order. 3.High qu
Cas:555-30-6
Min.Order:10 Gram
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inquiry1.No Less 8 years exporting experience. Clients can 100% received goods 2.Lower Price with higher quality 3,Free sample 4,We are sincerely responsible for the "product quality" and "After Service" Upbio is Specialized
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inquiryHanways Chempharm Co., Limited, the former is Hubei Hanways Pharchem CO.,Limited, set up in 2009 in Wuhan, China. We specialize in sourcing and supplying APIs, pharmaceutical intermediates, and fine chemicals for worldwide markets. The founder has d
Cas:555-30-6
Min.Order:1 Kilogram
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Type:Trading Company
inquiryWe are the manufacturers and suppliers of API in China, and warehouse in Germany and USA of California, which can quickly and safely deliver to your address 1.High quality and competitive price. 2.Free sample for your evaluation. 3.Promptly delivery
Cas:555-30-6
Min.Order:10 Gram
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Type:Trading Company
inquiryMethyldopa CAS:555-30-6 Qingdao Belugas Import and Export Co., Ltd. is a scientific and technological company integrating research and development, production and trade of chemical intermediates, specializing in high quality organic intermediates, s
Cas:555-30-6
Min.Order:1 Gram
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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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inquiryAdvantage : LIDE PHARMACEUTICALS LTD. is a mid-small manufacturing-type enterprise, engaged in pharmaceutical intermediates of R&D, custom-made and production, and also involving trading chemicals for export. We have established the R&
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inquiry1)Quick Response Within 12 hours; 2)Quality Guarantee: All products are strictly tested by our QC, confirmed by QA and approved by third party lab in China, USA, Canada, Germany, UK, Italy, France etc. 3) OEM/ODM Available; 4) Reasonable & Compet
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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
Cas:555-30-6
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Type:Lab/Research institutions
inquiryProduct Detail Minimum Order Qty. 10 Gram
Cas:555-30-6
Min.Order:10 Gram
Negotiable
Type:Trading Company
inquiryOur Services 1. New Molecules R&D 2. Own test center HPLC NMR GC LC-MS 3. API and Intermediates from China reputed manufacturers 4. Documents support COA MOA MSDS DMF open part Our advantages 1. Government awarded company. Top 100 enter
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inquirysuperior quality Appearance:colourless crystals Storage:Stored in cool, dry and ventilation place; Away from fire and heat Package:1kg/bag, 1kg/drum or 25kg/drum or as per your request. Application:Antihypertensor;L-aromatic aminoacid decarboxylase
Cas:555-30-6
Min.Order:1 Kilogram
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inquiryHubei Yuanmeng Biological Technology Co., Ltd., which is located in Wuhan, China. We are specializing in the exportation of APIs, and plant extracts ect. Our products has been exported to America, Australia, Brazil, the Europe, Middle East and other
Cas:555-30-6
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inquiryHangzhou KeyingChem Co., Ltd. exported this product to many countries and regions at best price. If you are looking for the material’s manufacturer or supplier in China, KeyingChem is your best choice. Pls contact with us freely for getting det
J&H CHEM R&D center can offer custom synthesis according to the contract research and development services for the fine chemicals, pharmaceutical, biotechnique and some of the other chemicals. J&H CHEM has some Manufacturing base in Jia
Chemlyte Solutions believe that customers and suppliers deserve much more than what traditional distributors can offer. To grow in today s fast-paced and increasingly competitive market it is essential to be able to quickly adapt to market forces eff
Our Advantage & Service 1.Top quality: Using high quality material and establishing a strict quality control system,assigning specific persons in charge of each part of production,from raw material purchase to assembly. 2 Professional R&D
Cas:555-30-6
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inquiryOur Advantages Production: Advanced chemical equipment with years of experience.Staffs for producing various extract products. Quality Control:A complete set of Testing Professional and Analysis Equipment ensures the Quality Requirements and Speci
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inquirymethyldopa
Conditions | Yield |
---|---|
With methyloxirane In ethanol for 3h; Inert atmosphere; Reflux; | 86% |
(S)-N-Acetyl-α-methyl-β-(3,4-dimethoxyphenyl)alanin
methyldopa
Conditions | Yield |
---|---|
With hydrogen bromide Heating; |
(S)-3-(3,4-dimethoxyphenyl)-2-methylalanine
methyldopa
Conditions | Yield |
---|---|
With hydrogen bromide |
(2S)-2-amino-2-methyl-3-(3,4-dimethoxyphenyl)propanamide
methyldopa
Conditions | Yield |
---|---|
With hydrogen bromide |
N-Chloroacetyl-α-methyl-DOPA
A
methyldopa
B
N-Chloroacetyl-D-α-methyl-DOPA
Conditions | Yield |
---|---|
With potassium hydroxide; potassium phosphate buffer; porcine kidney acylase I at 40℃; relative initial rate of hydrolysis, also with Aspergillus acylase I as a catalyst; with or without CoCl2; |
(2S,5S)-1-benzoyl-2-(tert-butyl)-5-(3',4'-dimethoxybenzyl)-3,5-dimethylimidazolidin-4-one
methyldopa
Conditions | Yield |
---|---|
With hydrogenchloride at 175 - 185℃; for 4h; |
4-bromomethyl-1,2-dimethoxybenzene
methyldopa
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: tetrahydrofuran; hexane / 2 h / -78 - 0 °C 2: aq. 6N HCl / 4 h / 175 - 185 °C View Scheme | |
Multi-step reaction with 4 steps 1: NaH / tetrahydrofuran / 0 - 25 °C 2: α-chymotrypsin / dimethylsulfoxide; H2O / 22 - 25 °C / potassium phosphate ( pH 7.0); with pig liver esterase the reaction rate is higher but the e.e. is lower 3: 1.) acyl azide formation, 2.) Curtius rearrangement 4: aq. HBr (48percent) View Scheme |
benzyl-veratryliden-amine
methyldopa
Conditions | Yield |
---|---|
Multi-step reaction with 4 steps 1: 85 percent / 1.) NEt3 / CH2Cl2 / 1.) -78 deg C; 2.) -78-0 deg C 2: 90 percent / 1.) LiHMDS 3: 90 percent / Li/NH3 / tetrahydrofuran; 2-methyl-propan-2-ol 4: aq. HBr View Scheme |
(3S,4R)-1-benzyl-3-<2-oxo-4(S)-phenyloxazolidinyl>-4-(3,4-dimethoxyphenyl)azetidin-2-one
methyldopa
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1: 90 percent / 1.) LiHMDS 2: 90 percent / Li/NH3 / tetrahydrofuran; 2-methyl-propan-2-ol 3: aq. HBr View Scheme |
(3S,4R)-1-benzyl-3-methyl-3-<2-oxo-(4S)-phenyloxazolidinyl>-4-(3,4-dimethoxyphenyl)azetidin-2-one
methyldopa
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: 90 percent / Li/NH3 / tetrahydrofuran; 2-methyl-propan-2-ol 2: aq. HBr View Scheme |
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1: α-chymotrypsin / dimethylsulfoxide; H2O / 22 - 25 °C / potassium phosphate ( pH 7.0); with pig liver esterase the reaction rate is higher but the e.e. is lower 2: 1.) acyl azide formation, 2.) Curtius rearrangement 3: aq. HBr (48percent) View Scheme |
(R)-2-(3,4-Dimethoxy-benzyl)-2-methyl-malonic acid monomethyl ester
methyldopa
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: 1.) acyl azide formation, 2.) Curtius rearrangement 2: aq. HBr (48percent) View Scheme |
4-(3,4-dimethoxy-benzyl)-2,4-dimethyl-4H-oxazol-5-one
methyldopa
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1: (i) Na, benzene, (ii) /BRN= 4145678/ 2: KOH / aq. ethanol / Heating 3: aq. HBr / Heating View Scheme |
methyldopa
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: KOH / aq. ethanol / Heating 2: aq. HBr / Heating View Scheme |
methyldopa
(S)-3-(1-naphthoyl)-4-(benzo[d][1,3]dioxol-5-ylmethyl)-2,2,4-trimethyloxazolidin-5-one
methyldopa
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1: sodium hydroxide / tetrahydrofuran; water / Reflux; Inert atmosphere 2: hydrogenchloride; acetic acid / phenol / 4 h / 115 °C / Sealed tube; Inert atmosphere 3: methyloxirane / ethanol / 3 h / Inert atmosphere; Reflux View Scheme |
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1.1: sodium methylate / N,N-dimethyl-formamide / 2.08 h / 20 °C / Large scale 2.1: p-toluenesulfonyl chloride; triethylamine / dichloromethane / 2.5 h 2.2: 1.3 h 3.1: hydrogen bromide / water / 4 h / 60 °C / Large scale View Scheme |
methyldopa
Conditions | Yield |
---|---|
With hydrogen bromide In water at 60℃; for 4h; Large scale; | 177 kg |
di-tert-butyl dicarbonate
methyldopa
(S)-N-(tert-butoxycarbonyl)-3-hydroxy-α-methyltyrosine
Conditions | Yield |
---|---|
With triethylamine In N,N-dimethyl-formamide at 60℃; for 18h; | 100% |
at 60℃; for 96h; Inert atmosphere; |
methanol
methyldopa
α-methyl-β-3,4-dihydroxyphenyl-(L)-alanine methyl ester hydrochloride
Conditions | Yield |
---|---|
With thionyl chloride at -15 - 20℃; for 72h; Heating / reflux; | 97% |
With hydrogenchloride | |
With thionyl chloride at 65℃; for 144h; |
methyldopa
acetyl chloride
(2S)-N-acetyl-3-(3',4'-diacetoxyphenyl)-2-methylalanine
Conditions | Yield |
---|---|
In acetic acid at 45℃; | 90% |
Conditions | Yield |
---|---|
With hydrogenchloride Reflux; | 90% |
Conditions | Yield |
---|---|
With hydrogenchloride Reflux; | 90% |
Conditions | Yield |
---|---|
With hydrogenchloride at 30 - 40℃; for 48h; Temperature; | 71.7% |
With thionyl chloride |
methyldopa
Conditions | Yield |
---|---|
With sodium hydroxide In ethanol; water Ru-complex was refluxed in mixt. of H2O and EtOH, to this soln. was added ligand followed by aq. NaOH, mixt. was heated at 70°C for 30 min, cooled to room temp., filtered, aq. soln. of NaClO4 was added, mixt.was stored in the dark for 48 h; solid was collected at the pump, washed with ice-cold H2O, dried in vac. over silica gel at room temp.; elem. anal.; | 71% |
methyldopa
S-benzoyl-3-mercaptopropanoyl chloride
N,O,O'-tris(S-benzoyl-3-mercaptopropanoyl)-L-α-methyldopa
Conditions | Yield |
---|---|
With sodium hydroxide In water for 2h; | 66% |
methyldopa
Conditions | Yield |
---|---|
61.3% |
methyldopa
Conditions | Yield |
---|---|
With sodium hydroxide In ethanol; water Ru-complex was refluxed in mixt. of H2O and EtOH, to this soln. was added ligand followed by aq. NaOH, mixt. was heated at 70°C for 30 min, cooled to room temp., filtered, aq. soln. of NaClO4 was added, mixt.was stored in the dark for 48 h; solid was collected at the pump, washed with ice-cold H2O, dried in vac. over silica gel at room temp.; elem. anal.; | 48% |
1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofuranose
methyldopa
A
methyl-2 <(tri-O-benzoyl-2',3',5' β-D-ribofuranosyl)-3 hydroxy-4 phenyl>-3 alanine
B
N-acetyl tri-O-benzoyl-2,3,5-D-ribofuranosylamine
C
1-O-acetyl-2,3,5-tri-O-benzoyl-D-ribofuranose
Conditions | Yield |
---|---|
With boron trifluoride diethyl etherate In acetonitrile for 48h; Ambient temperature; Further byproducts given. Yields of byproduct given; | A 46% B n/a C n/a |
Conditions | Yield |
---|---|
In phosphate buffer at 90℃; for 3h; pH=7.4; Pictet-Spengler reaction; | A 16% B 20% C 30% D 10% |
N-(3-hydroxypropyl)acetamide
methyldopa
(S)-2-Amino-3-(3,4-dihydroxy-phenyl)-2-methyl-propionic acid 3-acetylamino-propyl ester
Conditions | Yield |
---|---|
(i) SOCl2, (ii) /BRN= 1744826/, DMF; Multistep reaction; |
methyldopa
acetic anhydride
(S)-4-(3,4-diacetoxy-benzyl)-2,4-dimethyl-4H-oxazol-5-one
Conditions | Yield |
---|---|
In pyridine |
Conditions | Yield |
---|---|
In dimethyl sulfoxide | |
With tetra(n-butyl)ammonium hydrogensulfate 1.) DMF, RT, 1 h, 2.) DMF, 60 deg C, 6 h; Yield given. Multistep reaction; |
methyldopa
4-bromomethyl-1,3-dioxa-5-methylcyclopentene-2-one
(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl (S)-3-hydroxy-α-methyltyrosinate
Conditions | Yield |
---|---|
With N,N-dimethyl-formamide for 3h; Ambient temperature; |
methyldopa
4-(bromomethyl)-5-(tert-butyl)-1,3-dioxol-2-one
(5-tert-butyl-2-oxo-1,3-dioxol-4-yl)methyl (S)-3-hydroxy-α-methyltyrosinate
Conditions | Yield |
---|---|
With N,N-dimethyl-formamide at 20 - 25℃; for 3h; |
methyldopa
(D)-3-(Benzoylthio)-2-methylpropanoic acid
N-(S-benzoyl-3-mercapto-2-methylpropanoyl)-L-α-methyldopa
Conditions | Yield |
---|---|
With sodium borate; triethylamine; isobutyl chloroformate 1.) THF, -10 deg C, 10 min, 2.) THF, water, room temperature, 1h; Yield given. Multistep reaction; |
Conditions | Yield |
---|---|
With sodium hydrogencarbonate; potassium hexacyanoferrate(III) In water | 2.10 g |
Conditions | Yield |
---|---|
With NH4OH-NH4Cl buffer; pyridoxal 5'-phosphate at 30℃; for 0.5h; relative rate of CO2 evolution by aromatic L-amino acid decarboxylase from Micrococcus percitreus; |
methyldopa
Conditions | Yield |
---|---|
With sodium azide; dinitrogen monoxide In water Kinetics; Irradiation; pulse radiolysis; | |
With oxygen In phosphate buffer at 20℃; pH=6.8; Enzyme kinetics; Further Variations:; Reagents; | |
In aq. phosphate buffer pH=7; Kinetics; pH-value; Electrochemical reaction; |
methyldopa
acetic anhydride
(2S)-N-acetyl-3-(3',4'-diacetoxyphenyl)-2-methylalanine
Conditions | Yield |
---|---|
With pyridine at 95℃; for 3h; Yield given; |
thiobenzoic acid potassium salt
methyldopa
2-Bromopropionyl chloride
N-(S-benzoyl-2-mercaptopropanoyl)-L-α-methyldopa
Conditions | Yield |
---|---|
With sodium borate; sodium hydroxide 1.) water, ether, 1h, room temperature, 1h, 2.) water, ether, room temperature, overnight; Yield given. Multistep reaction; |
methyldopa
Conditions | Yield |
---|---|
With sodium periodate In phosphate buffer for 0.166667h; pH=6.0; Oxidation; cyclization; |
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