Enantioselective addition of organozinc reagents to carbonyl compounds catalyzed by a camphor derived chiral γ-amino thiol ligand
作者:Hsyueh-Liang Wu、Ping-Yu Wu、Ying-Ni Cheng、Biing-Jiun Uang
DOI:10.1016/j.tet.2015.07.038
日期:2016.5
synthesis of the chiral camphor derived γ-amino thiol ligand 17 and its application in catalytic enantioselective carbon-carbon forming reactions through the addition of organozinc reagents to carbonyl compounds is described. The catalytic activity and enantioselectivity of ligand 17 is demonstrated in the enantioselective addition of various organozinc reagents to aldehydes and ketoesters, offering the corresponding
Enantioselective synthesis of quaternary stereogenic centers through catalytic asymmetric addition of dimethylzinc to α-ketoesters with chiral cis-cyclopropane-based amide alcohol as ligand
作者:Bing Zheng、Shicong Hou、Zhiyuan Li、Hongchao Guo、Jiangchun Zhong、Min Wang
DOI:10.1016/j.tetasy.2009.07.050
日期:2009.9
A new amino alcohol with a chiral cyclopropane backbone has been developed and used in the catalyticasymmetric diethylzinc addition to various types of α-ketoesters. This cyclopropane-based chiral amino alcohol shows moderate enantioselectivity in the addition of organozinc to α-ketoesters. For dimethylzinc addition to α-ketoesters, up to 81% ee are obtained, respectively.
Asymmetric Addition of Dimethylzinc to α-Ketoesters Catalyzed by (−)-MITH
作者:Hsyueh-Liang Wu、Ping-Yu Wu、Ying-Ying Shen、Biing-Jiun Uang
DOI:10.1021/jo801034q
日期:2008.8.1
This investigation describes the catalytic asymmetric addition of dimethylzinc to α-ketoesters in the presence of (−)-MITH (5) and triethyl borate as an additive to give the corresponding chiral α-hydroxy esters with good yields and high enantioselectivities.
enantioenriched tertiaryalcohols in pharmaceutical chemistry, efficient and green strategies for their synthesis are highly sought after. Here, we report a simple synthesis of the elusive chiral tertiaryalcohols. A cytochrome P450 monooxygenase called P450PL2 was developed to enable chiral tertiaryalcohols by the benzylic CH bonds asymmetric hydroxylation of the racemic tertiary carbon substrates
鉴于对映体丰富的叔醇在药物化学中的重要性和有益特性,高效且绿色的合成策略受到高度追捧。在这里,我们报告了难以捉摸的手性叔醇的简单合成。开发了一种称为 P450 PL2的细胞色素 P450 单加氧酶,通过外消旋叔碳底物的苄基 C H 键不对称羟基化来生成手性叔醇。这种 P450 催化方案提供了各种手性叔醇,具有意想不到的官能团耐受性和优异的对映选择性(高达 >99% ee)。该方法反应温和,采用分子氧作为氧化剂,避免了预氧功能化底物的使用。进行了初步的分子动力学模拟研究,以揭示 P450 PL2催化过程中底物异常选择性羟基化的可能原因。