Chiral α-keto orthoesters derived from tartaric acid can be reduced diastereoselectively. Hydrolysis affords optically active α-hydroxyacids and the recovered auxiliary.
衍生自酒石酸的手性α-酮原酸酯可以非对映选择性地还原。水解得到旋光的α-羟基酸和回收的助剂。
Oxalyl‐CoA Decarboxylase Enables Nucleophilic One‐Carbon Extension of Aldehydes to Chiral α‐Hydroxy Acids
作者:Simon Burgener、Niña Socorro Cortina、Tobias J. Erb
DOI:10.1002/anie.201915155
日期:2020.3.27
be reversed to perform nucleophilic C1 -extensions of various aldehydes to yield the corresponding 2-hydroxyacyl-CoA thioesters. We improved the catalytic properties of Methylorubrum extorquens OXC by rational enzyme engineering and combined it with two newly described enzymes-a specific oxalyl-CoA synthetase and a 2-hydroxyacyl-CoA thioesterase. This enzymatic cascade enabled continuous conversion
从简单的、可再生的碳单元合成复杂的分子是可持续经济的目标。在这里,我们探索了硫胺素二磷酸依赖性(ThDP)草酰辅酶A脱羧酶(OXC)/2-羟酰辅酶A裂解酶(HACL)超家族的生物催化潜力,该家族通过释放C1-单位甲酰辅酶A。我们表明 OXC/HACL 超家族包含混杂的成员,这些成员可以逆转以进行各种醛的亲核 C1 延伸,产生相应的 2-羟基酰基-CoA 硫酯。我们通过合理的酶工程改进了 Mmethylorubrum extorquens OXC 的催化性能,并将其与两种新描述的酶(特定的草酰辅酶 A 合成酶和 2-羟酰辅酶 A 硫酯酶)相结合。这种酶级联能够将草酸盐和芳香醛连续转化为有价值的 (S)-α-羟基酸,对映体过量高达 99%。
Cephalosporin compounds
申请人:TANABE SEIYAKU CO., LTD.
公开号:EP0376724A2
公开(公告)日:1990-07-04
Cephalosporin compounds of the formula:
wherein R1 is amino or protected amino; R2 is substituted or unsubstituted heterocyclic group having 1 - 3 hetero atoms selected from oxygen and sulphur; R3 is carboxyl or protected carboxyl; R4 is nucleophilic compound residue; R5 is carboxyl, protected carboxyl and -COO-, a pharmaceutically acceptable salt thereof and their synthetic intermediate of the formula:
wherein R11 is amino or protected amino; R2 is substituted or unsubstituted heterocyclic group having 1 - 3 hetero atoms selected from oxygen and sulfur; R3 is carboxyl or protected carboxyl; -COOY is carboxyl or protected carboxyl. Said cephalosporin compound is useful as antibacterial agent.
Enzymatic Enantioselective Decarboxylative Protonation of Heteroaryl Malonates
作者:Ross Lewin、Mark Goodall、Mark L. Thompson、James Leigh、Michael Breuer、Kai Baldenius、Jason Micklefield
DOI:10.1002/chem.201406014
日期:2015.4.20
α‐hydroxycarboxylic acids, including pharmaceutical precursors, from readily accessible α‐hydroxymalonates. The enzymatic method described here represents an improvement upon existing synthetic chemistry methods that have been used to produce similar compounds. The relationship between the structural features of these new substrates and the kinetics associated with their enzymatic decarboxylation is explored