Application of α-amino acids for the transition-metal-free synthesis of pyrrolo[1,2-a]quinoxalines
作者:Huanhuan Liu、Feiyu Zhou、Wen Luo、Yuxin Chen、Chenyang Zhang、Chen Ma
DOI:10.1039/c7ob01688c
日期:——
A practical and concise protocol for the efficient synthesis of pyrrolo[1,2-a]quinoxalines from readily available α-amino acids and 2-(1H-pyrrol-1-yl)anilines under transition metal-free conditions has been established. This protocol, which includes the formation of new C–C and C–N bonds, features a wide substrate scope with a broad range of functional group tolerance.
建立了一种实用且简洁的方案,可在无过渡金属的条件下从容易获得的α-氨基酸和2-(1 H-吡咯-1-基)苯胺有效合成吡咯并[1,2- a ]喹喔啉。该协议包括新的C–C和C–N键的形成,具有广泛的底物范围和广泛的官能团耐受性。
Electrochemical reduction in liquid ammonia: electrolytic birch reactions and chemical bond fissions
作者:J. Chaussard、C. Combellas、A. Thiebault
DOI:10.1016/s0040-4039(00)95318-8
日期:1987.1
A procedure of electrochemical reduction in liquid ammonia using a single-compartment cell equiped with a soluble anode is described and illustrated in the case of aromatic compounds and esters.
[EN] SALT OF DIHYDROPHENYLGLYCINE METHYL ESTER<br/>[FR] SEL D'ESTER MÉTHYLIQUE DE DIHYDROPHÉNYLGLYCINE
申请人:DSM SINOCHEM PHARM NL BV
公开号:WO2017021390A1
公开(公告)日:2017-02-09
The present invention relates to the hemi sulfuric acid salt of methyl (R)-2-amino-2-(cyclohexa-1,4-dien-1-yl)acetate, also trivially referred to as the hemi sulfuric acid salt of D-dihydrophenylglycine methyl ester, to a method for the preparation of said salt and to the use of said salt in the enzymatic synthesis of antibiotics.
Compounds of the formula: L-p-Glu-L-His-L-Trp-L-Ser-L-Tyr-D-2-(cyclohexyl)Gly-Y-L-Arg-L-Pro-NHC.sub.2 H.sub.5 in which Y is L-Leu or L-(N-methyl)-Leu or a non-toxic acid addition salt thereof, are potent ovulation inducers and claudogenic-interceptive agents useful in preventing or terminating pregnancy in mammals.
Characterization and engineering of cephalosporin C acylases to produce 7-Aminocephalosporanic acid
作者:Xiangying Li、Jingang Wang、Wencheng Su、Congcong Li、Ge Qu、Bo Yuan、Zhoutong Sun
DOI:10.1016/j.mcat.2023.113595
日期:2023.11
8-fold increase in specific enzymatic activity (6.1 U/mg) was obtained compared to the wild-type enzyme. The engineered variant also enabled the hydrolysis of a variety of β-lactam antibiotics including Penicillin G and phenylacetyl-7-aminodeacetoxycephalosporanic acid (G-7-ADCA). Overall, this study discovered new CCAs from distinct bacterial origins and enabled the synthesis of various core β-lactam
7-氨基头孢烷酸(7-ACA)是合成β-内酰胺类抗生素的核心核。头孢菌素 C 酰化酶 (CCA) 是一类能够将头孢菌素 C (CPC) 水解为 7-ACA 的酶。在这项研究中,我们鉴定、表征并设计了新的 CCA 来制备 7-ACA。使用组合活性位点饱和测试(CAST)和迭代进化进行多轮半理性酶设计后获得最佳突变体A14(L159S/A419V)。与野生型酶相比,酶比活性增加了 2.8 倍(6.1 U/mg)。该工程变体还能够水解多种 β-内酰胺抗生素,包括青霉素 G 和苯乙酰基-7-氨基脱乙酰氧基头孢菌酸 (G-7-ADCA)。全面的,