PROCESS FOR PREPARATION OF OPTICALLY ACTIVE 1-SUBSTITUTED AMINO-2,3-EPOXYPROPANES, INTERMEDIATES FOR THE SYNTHESIS THEREOF AND PROCESS FOR PREPARATION OF THE INTERMEDIATES
Process for preparation of optically active 1-substituted amino-2,3-epoxypropanes, intermediates for synthesis thereof and process for preparation of the intermediates
申请人:Kitajima Kumi
公开号:US20050215801A1
公开(公告)日:2005-09-29
The present invention provides an industrial process for effectively and advantageously preparing optically active 1-substituted amino-2,3-epoxypropanes useful as intermediates for preparing agricultural chemicals and medical products from optically active 1-substituted amino-2,3-propanediols used as raw materials. The present invention also provides useful intermediates. Specifically, an optically active 1-substituted amino-2,3-propanediol (1) is reacted with an orthoacid ester (2) or thionyl chloride (3) to produce a cyclic optically active compound (4), and then a compound (5) containing a halogen atom is prepared by reaction with a ring-opening reaction agent having an ability to introduce a halogen atom X. Finally, an optical active 1-substituted amino-2,3-epoxypropane is prepared by ring-closure reaction in the presence of a base.
Hafnium(IV)-Salen-Catalyzed Highly Reactive and Enantioselective Epoxidation Directed by Amides
作者:Jia-Lin Yao、Zhi Li
DOI:10.1021/acscatal.4c03648
日期:2024.8.16
enantioselective olefin epoxidation was limited to a few types of directing groups and relatively low catalyst activities. Herein, an expeditious asymmetric epoxidation protocol is reported for allylic amides and sulfonamides using a hafnium-BINAM-salen catalyst with high enantioselectivity and turnover frequency. Aryl carboxamides of allylic amines with a trisubstituted olefin motif were suitable substrates