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.
The asymmetric addition of lithium acetylides to carbonylcompounds in the presence of a chiral lithium binaphtholate catalyst was developed. A procedure involving the slow addition of carbonylcompounds to lithium acetylides improved the enantioselectivity. This reaction afforded diverse chiral secondary and tertiary propargylic alcohols in high yields and with good to high enantioselectivities.