A practical synthesis of optically active aromatic epoxides via asymmetric transfer hydrogenation of α-chlorinated ketones with chiral rhodium–diamine catalyst
A practical method for the synthesis of optically active aromatic epoxides has been developed via the formation of optically active α-chlorinated alcohols and intramolecular etherification. Optically active alcohols with up to 99% ee can be obtained from the asymmetric reduction of aromaticketones with a substrate/catalyst ratio of 1000–5000 using a formic acid/triethylamine mixture containing a well-defined
A Versatile Route to (<i>E</i>)- and (<i>Z</i>)-2-Hydroxy-3,4-unsaturated Disubstituted Sulfilimines and Their Haloamidation Reaction
作者:Sadagopan Raghavan、Shaik Mustafa、B. Sridhar
DOI:10.1021/jo900569z
日期:2009.6.19
alpha-Chloro ynones have been reduced using Noyori's Ru catalyst to furnish alpha-chloro propargylic alcohols with excellent enantioselectivity. These have been used as a common precursor for the preparation of (E)- and (Z)-2-hydroxy-3,4-unsaturated disubstituted sullfilimines. The latter serve as precursors for the highly regio- and stereoselective preparation of bromo carbamates.
Highly Enantioselective Preparation of Multifunctionalized Propargylic Building Blocks