Direct asymmetric hydrogenation of α-keto acids by using the highly efficient chiral spiro iridium catalysts
作者:Pu-Cha Yan、Jian-Hua Xie、Xiang-Dong Zhang、Kang Chen、Yuan-Qiang Li、Qi-Lin Zhou、Da-Qing Che
DOI:10.1039/c4cc07643e
日期:——
A new efficient and highly enantioselective direct asymmetrichydrogenation of alpha-keto acids employing the Ir/SpiroPAP catalyst under mild reaction conditions has been developed. This method might be feasible for the preparation of a series of chiral alpha-hydroxy acids on a large scale.
Chiral Thiols: The Assignment of Their Absolute Configuration by <sup>1</sup>H NMR
作者:Silvia Porto、José Manuel Seco、Aurelio Ortiz、Emilio Quiñoá、Ricardo Riguera
DOI:10.1021/ol7022196
日期:2007.11.1
A general NMR spectroscopy protocol for determination of absoluteconfiguration of thiols, that includes the introduction of new aryl-tert-butoxyacetic acids as chiral derivatizing agents (CDAs), is described.
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%。
NEW AMINO ACID DERIVATIVES
申请人:AstraZeneca AB
公开号:US20040087647A1
公开(公告)日:2004-05-06
There is provided amino acid derivatives of formula I,
1
wherein p, q, R
1
, R
2
, R
3
, R
4
, Y, n and B have meanings given in the description which are useful as competitive inhibitors of trypsin-like proteases, such as thrombin, and in particular in the treatment of conditions where inhibition of thrombin is required (e.g. thrombosis) or as anticoagulants.
There is provided amino acid derivatives of formula I,
1
wherein p, q, R
1
, R
2
, R
3
, R
4
, Y, n and B have meanings given in the description which are useful as competitive inhibitors of trypsin-like proteases, such as hirombin, and in particular in the treatment of conditions where inhibition of thrombin is required (e.g. thrombosis) or as anticoagulants.