Dayangchem's 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. DayangChem can provide different quantities
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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.In No Less 10 years exporting experience. you 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 Specializ
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inquiryN-CARBOBENZYLOXY-L-ASPARTIC ANHYDRIDE CAS:4515-23-5 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 qual
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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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inquiryCompany Introduction 1. Established in 2005, with two independent business divisions: Fine chemicals division; Pharmaceutical division. 2. Main product: Optical brightener Textile auxiliary Dye stuff Pigments
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inquiryJ&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
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inquiryZibo Hangyu Biotechnology Development Co., Ltd is a leading manufacturer and supplier of chemicals in China. We develop produce and distribute high quality pharmaceuticals, intermediates, special chemicals and OLED intermediates and other fine chemi
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inquiryN-CARBOBENZYLOXY-L-ASPARTIC ANHYDRIDE Chemical Properties Melting point 123-124 °C(lit.) Boiling point 490℃ density 1.37 Fp 250℃ pka 9.93±0.20(Predicted) optical activity [α]20/D 25°, c = 1 in methanol Safet
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inquiryHunan chemfish Pharmaceutical co.,Ltd a comprehensive enterprise, is located in High-Tech Science Park,Changsha,Chia . Specializing in R&D, manufacture and marketing, we provide a wide range of products and the most professional services to meet the
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inquiryShanghai Finebiotech Co.,Ltd.was established in 2020, which providing professional chemical services. As a customer-oriented company, we have distinguished ourself from others in providing worldwide customers with cost-effective and efficient service
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inquiry1.Our services:A.Supply sampleB.The packing also can be according the customers` requirmentC.Any inquiries will be replied within 24 hoursD.we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate.
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inquiryAnsciep Chemical is a professional enterprise manufacturing and distributing fine chemicals and speciality chemicals. We have been dedicated to heterocycle compounds and phenyl rings for tens of years. This is our mature product for export. Our quali
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inquiryAppearance:solid or liquid Storage:sealed in cool and dry place Package:As customer's requested Application:Pharma Intermediate Transportation:by courier/air/sea Port:Any port in China
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inquiry(S)-(2,5-Dioxo-tetrahydro-furan-3-yl)-carbamic acid benzyl esterAppearance:white crystalline powder Storage:Store in dry, dark and ventilated place Package:25KG drum Application:pharmaceutical intermediate Transportation:by air, by sea, by express
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inquiry4515-23-5 Application:intermediate
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inquirylow price and high purityAppearance:solid or liquid Storage:in sealed air resistant place Package:As customer require Application:Pharma;Industry;Agricultural Transportation:by sea or by airplane Port:any port in China
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inquiryGood Quality Package:1kg/bag Application:Medical or chemical Transportation:Air/Train/Sea Port:Shenzhen
bulk?production Application:Pharmaceutical intermediates
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inquiryfactory?direct?saleAppearance:White powder Storage:Sealed and preserved Package:200/Kilograms Application:healing drugs Transportation:By sea Port:Shanghai/tianjin
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inquiry1.Professional synthesis laboratory and production base. 2.Strong synthesis team and service team. 3.Professional data management system. 4.We provide the professional test date and product information ,ex. HNMR ,CNMR,FNMR, HPLC/G
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inquiryFor quick quotation, please send us the inquiry include CAS#, Structure, Chemical Name, quantity, purity, as well as any additional specifications you require, we will try to get back to you within 24 hours. Our Services Besides manufacturing,
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inquirySuperiority 1.We have more than 10 years experience in this area. 2.We could offer you competitive prices with satisfied quality. 3.Our company provides after-sale service and technical assistance as the customers requirements. 4.As first c
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inquiryHuBei ipure is a diversified product production and operation enterprise, with API, pharma intermediates, and other fine chemicals as well as R&D and pigments development and sales as one of the large enterprises, with more than 130 acres of pl
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inquiryfactory,reasonable price Appearance:detailed see specifications Storage:Store in dry, dark and ventilated place. Package:according to the clients requirement Application:pharmaceutical intermediates Transportation:by courier,air or sea Port:c
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inquiryApeptide is a famous-peptide manufacturer in China,We supply high quality peptides(Custom Peptides\Amino acids\API pepitdes and so on )with the best competitive price and short lead time.,Please check our website: www.apeptides.com/en/Appearance:pow
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inquiryUnited Scientific Company Located in Shanghai of China , is a competitive player in the global specialty and fine chemical market. Fenghua has both the expertise and flexibility to produce a wide range of chemicals. Focusing on developing the innovat
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inquiryShanghai AngewChemCo., Ltd. is an innovative enterprise on fine chemicals and pharmaceuticals. Based on Shanghai R&D center and Hunan chemical manufacturing plant, we offer chemical research, process development, and large-scale production. Complete
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inquiryConditions | Yield |
---|---|
100% | |
With dicyclohexyl-carbodiimide In ethyl acetate 1.) 1 h, 0 deg C, 2.) 24 h, r.t.; | 98% |
With acetic anhydride for 0.0166667h; microwave irradiation; | 98% |
N-Cbz-L-Asp
A
benzyl N-[(3R)-2,5-dioxotetrahydrofuran-3-yl]carbamate
B
N-benzyloxycarbonyl-L-aspartic acid anhydride
Conditions | Yield |
---|---|
With acetic anhydride at 20 - 45℃; for 2.25h; Product distribution; Further Variations:; Reagents; Solvents; Temperatures; |
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: 89 percent 2: 98 percent / dicyclohexylcarbodiimide / ethyl acetate / 1.) 1 h, 0 deg C, 2.) 24 h, r.t. View Scheme | |
Multi-step reaction with 2 steps 1: K2CO3 / H2O / Ambient temperature 2: Ac2O / acetic acid / Ambient temperature View Scheme | |
Multi-step reaction with 2 steps 1: K2CO3 / H2O 2: Ac2O / acetic acid View Scheme |
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1: toluene / anfangs unter Kuehlung 2: MgO; water; diethyl ether 3: acetic acid anhydride View Scheme |
Conditions | Yield |
---|---|
With triethylamine In dichloromethane for 12h; | 97% |
With triethylamine In dichloromethane for 12h; | 97% |
N-benzyloxycarbonyl-L-aspartic acid anhydride
benzyl (3S)-5-oxotetrahydro-3-furanylcarbamate
Conditions | Yield |
---|---|
With sodium tetrahydroborate In tetrahydrofuran | 91% |
With sodium tetrahydroborate at 0℃; for 3h; | 91% |
With sodium tetrahydroborate | 86% |
aniline
N-benzyloxycarbonyl-L-aspartic acid anhydride
benzyloxycarbonyl-L-aspartic acid dianilide
Conditions | Yield |
---|---|
Stage #1: N-benzyloxycarbonyl-L-aspartic acid anhydride In dimethyl sulfoxide at 20℃; for 3h; Stage #2: aniline With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide In N,N-dimethyl-formamide at 20℃; for 24h; | 87% |
Stage #1: N-benzyloxycarbonyl-L-aspartic acid anhydride In N,N-dimethyl-formamide at 20℃; for 3h; Stage #2: aniline With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide In N,N-dimethyl-formamide at 20℃; for 24h; | 87% |
3-methyl-1,2,4-thiadiazol-5-amine
N-benzyloxycarbonyl-L-aspartic acid anhydride
2-benzyloxycarbonylamino-N-(3-methyl-[1,2,4]thiadiazol-5-yl)-succinamic acid
Conditions | Yield |
---|---|
In dimethyl sulfoxide at 20℃; for 2h; | 85% |
Conditions | Yield |
---|---|
at 90℃; for 3.5h; | 82% |
at 90℃; for 3.5h; | 72% |
ethanol
N-benzyloxycarbonyl-L-aspartic acid anhydride
(S)-3-(benzyloxycarbonylamino)-4-ethoxy-4-oxobutanoic acid
Conditions | Yield |
---|---|
at 20℃; for 36h; | 81% |
Heating; | |
With N-cyclohexyl-cyclohexanamine In diethyl ether | |
for 18h; Product distribution / selectivity; Heating / reflux; |
3,4-dimethoxyaniline
N-benzyloxycarbonyl-L-aspartic acid anhydride
[1,2-bis-(3,4-dimethoxy-phenylcarbamoyl)-ethyl]-carbamic acid benzyl ester
Conditions | Yield |
---|---|
With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide In N,N-dimethyl-formamide at 20℃; for 24h; | 79% |
N-benzyloxycarbonyl-L-aspartic acid anhydride
Conditions | Yield |
---|---|
Stage #1: N-benzyloxycarbonyl-L-aspartic acid anhydride With sodium hydroxide; hydroxylamine hydrochloride In 1,4-dioxane; water at 19.85 - 49.85℃; for 1.25h; Stage #2: at 124.85℃; for 0.333333h; | 77% |
With sodium hydroxide; hydroxylamine hydrochloride In 1,4-dioxane; water at 60℃; for 2h; | 75% |
With hydroxylamine hydrochloride; sodium carbonate In water at 0℃; for 1h; | 54% |
benzylamine
N-benzyloxycarbonyl-L-aspartic acid anhydride
(S)-(1-benzyl-2,5-dioxo-pyrrolidin-3-yl)carbamic acid benzyl ester
Conditions | Yield |
---|---|
toluene-4-sulfonic acid In DMF (N,N-dimethyl-formamide); toluene at 22 - 110℃; for 31h; Heating / reflux; Azeotropic dehydratation; | 77% |
toluene-4-sulfonic acid In DMF (N,N-dimethyl-formamide); toluene at 30 - 110℃; for 25h; Heating / reflux; | n/a |
In ethanol at 20℃; for 18h; | n/a |
4-tert-Butylaniline
N-benzyloxycarbonyl-L-aspartic acid anhydride
[1,2-bis-(4-tert-butyl-phenylcarbamoyl)-ethyl]-carbamic acid benzyl ester
Conditions | Yield |
---|---|
With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide In N,N-dimethyl-formamide at 20℃; for 25h; | 73% |
O-benzylhydoxylamine hydrochloride
N-benzyloxycarbonyl-L-aspartic acid anhydride
Conditions | Yield |
---|---|
In toluene for 1h; Heating; | 72% |
N-benzyloxycarbonyl-L-aspartic acid anhydride
N-benzyloxycarbonyl-L-aspartic acid α-p-nitrobenzyl ester
Conditions | Yield |
---|---|
69% |
Conditions | Yield |
---|---|
With acetic acid In benzene for 0.166667h; Heating; Yields of byproduct given; | A 67% B n/a |
In dimethyl sulfoxide for 0.333333h; Ambient temperature; Yield given. Yields of byproduct given; |
Conditions | Yield |
---|---|
Stage #1: N-benzyloxycarbonyl-L-aspartic acid anhydride In N,N-dimethyl-formamide at 20℃; for 3h; Stage #2: 4-methoxy-aniline With N-(3-dimethylaminopropyl)-N-ethylcarbodiimide In N,N-dimethyl-formamide at 20℃; for 24h; | 60% |
methanol
(3-methoxyphenyl)magnesium bromide
N-benzyloxycarbonyl-L-aspartic acid anhydride
B
dimethyl (2S)-2-[(phenylmethoxy)carbonylamino]-butane-1,4-dioate
Conditions | Yield |
---|---|
Stage #1: (3-methoxyphenyl)magnesium bromide; N-benzyloxycarbonyl-L-aspartic acid anhydride In tetrahydrofuran at -78℃; for 4h; Stage #2: With citric acid In tetrahydrofuran at -78 - 20℃; Stage #3: methanol With thionyl chloride | A 60% B n/a |
N-benzyloxycarbonyl-L-aspartic acid anhydride
(3S)-3-benzyloxycarbonylamino-4-hydroxybutanoic acid
Conditions | Yield |
---|---|
With sodium tetrahydroborate In tetrahydrofuran for 1h; Ambient temperature; | 59% |
Multi-step reaction with 2 steps 1: NaBH4 / tetrahydrofuran / 16 h / 20 °C 2: aq. CsCO3 / acetone / 3 h / 20 °C View Scheme |
aniline
N-benzyloxycarbonyl-L-aspartic acid anhydride
A
N-Benzyloxycarbonyl-L-asparaginsaeure-β-anilid
Conditions | Yield |
---|---|
With acetic acid In benzene for 0.166667h; Heating; Yields of byproduct given; | A n/a B 58% |
In dimethyl sulfoxide for 0.333333h; Ambient temperature; Yield given. Yields of byproduct given; |
4-aminomethyl-benzoic acid ; hydrochloride
N-benzyloxycarbonyl-L-aspartic acid anhydride
(S)-4-((3-(benzyloxycarbonylamino)-2,5-dioxopyrrolidin-1-yl)methyl)benzoic acid
Conditions | Yield |
---|---|
Stage #1: 4-aminomethyl-benzoic acid ; hydrochloride; N-benzyloxycarbonyl-L-aspartic acid anhydride With pyridine; triethylamine at 20℃; for 9h; Stage #2: With acetic acid at 83℃; for 24h; | 56% |
methanol
phenylmagnesium chloride
N-benzyloxycarbonyl-L-aspartic acid anhydride
A
dimethyl (2S)-2-[(phenylmethoxy)carbonylamino]-butane-1,4-dioate
Conditions | Yield |
---|---|
Stage #1: phenylmagnesium chloride; N-benzyloxycarbonyl-L-aspartic acid anhydride In tetrahydrofuran at -78℃; for 4h; Stage #2: With citric acid In tetrahydrofuran at -78 - 20℃; Stage #3: methanol With thionyl chloride | A n/a B 54% |
methanol
N-benzyloxycarbonyl-L-aspartic acid anhydride
(S)-2-benzyloxycarbonylamino-succinic acid 1-methyl ester
Conditions | Yield |
---|---|
Stage #1: methanol; N-benzyloxycarbonyl-L-aspartic acid anhydride In ethyl acetate at 20℃; for 5h; Stage #2: With N-cyclohexyl-cyclohexanamine In di-isopropyl ether Stage #3: With hydrogenchloride In water; ethyl acetate pH=2; | 54% |
N-benzyloxycarbonyl-L-aspartic acid anhydride
N-benzyloxycarbonyl-L-aspartic acid thioanhydride
Conditions | Yield |
---|---|
With sodium sulfide; tetrabutylammomium bromide In dichloromethane; water for 3h; | 47% |
With sodium sulfide; tetrabutylammomium bromide In dichloromethane; water for 3h; | 47% |
N-benzyloxycarbonyl-L-aspartic acid anhydride
Conditions | Yield |
---|---|
Stage #1: 1-(2-aminoethyl)-3-(benzyloxy)-2-methylpyridin-4(1H)-one hydrochloride salt With potassium hydroxide In methanol for 1h; Inert atmosphere; Stage #2: N-benzyloxycarbonyl-L-aspartic acid anhydride In N,N-dimethyl-formamide at 59.84℃; for 3h; Inert atmosphere; | 44% |
methanol
n-butyl magnesium bromide
N-benzyloxycarbonyl-L-aspartic acid anhydride
B
dimethyl (2S)-2-[(phenylmethoxy)carbonylamino]-butane-1,4-dioate
Conditions | Yield |
---|---|
Stage #1: n-butyl magnesium bromide; N-benzyloxycarbonyl-L-aspartic acid anhydride In tetrahydrofuran at -78℃; for 4h; Stage #2: With citric acid In tetrahydrofuran at -78 - 20℃; Stage #3: methanol With thionyl chloride | A 41% B n/a |
N-benzyloxycarbonyl-L-aspartic acid anhydride
Conditions | Yield |
---|---|
Stage #1: 1-(3-aminopropyl)-3-(benzyloxy)-2-methylpyridin-4(1H)-one hydrochloride salt With potassium hydroxide In methanol for 1h; Inert atmosphere; Stage #2: N-benzyloxycarbonyl-L-aspartic acid anhydride In N,N-dimethyl-formamide at 59.84℃; for 3h; Inert atmosphere; | 22% |
Conditions | Yield |
---|---|
With chloroform |
L-Valine methyl ester
N-benzyloxycarbonyl-L-aspartic acid anhydride
N-(N-benzyloxycarbonyl-L-α-aspartyl)-L-valine methyl ester
Conditions | Yield |
---|---|
With ethyl acetate | |
With potassium hydrogencarbonate; ethyl acetate |
L-Valine methyl ester
N-benzyloxycarbonyl-L-aspartic acid anhydride
A
N-(N-benzyloxycarbonyl-L-α-aspartyl)-L-valine methyl ester
B
N-(N-benzyloxycarbonyl-L-β-aspartyl)-L-valine methyl ester
Conditions | Yield |
---|---|
With potassium hydrogencarbonate; ethyl acetate | |
With ethyl acetate |
L-glutamic acid diethyl ester
N-benzyloxycarbonyl-L-aspartic acid anhydride
B
N-(N-benzyloxycarbonyl-L-α-aspartyl)-L-glutamic acid diethyl ester
Conditions | Yield |
---|---|
With ethyl acetate |
4-methyl pentanamine
N-benzyloxycarbonyl-L-aspartic acid anhydride
L-aspartic acid isohexyl imide
Conditions | Yield |
---|---|
at 130℃; Hydrieren des Reaktionsprodukts an Palladium/Kohle in Essigsaeure enthaltendem Aethanol; |
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