PROCESS FOR PRODUCING NITROGENOUS 5-MEMBERED CYCLIC COMPOUND
申请人:Japan Science and Technology Agency
公开号:EP1731509B1
公开(公告)日:2011-10-19
Process for producing nitrogenous 5-membered cyclic compound
申请人:Kobayashi Shu
公开号:US20070191614A1
公开(公告)日:2007-08-16
A method of the intramolecular and intermolecular cyclization of an N-acylhydrazone for obtaining a pyrazoline skeleton or pyrazolidine skeleton under ordinary conditions with high stereoselectivity and in high yield. An N-acylhydrazone represented by the following formula (I): (wherein R1 and R2 are the same or different and each represents hydrogen or a hydrocarbon group and Ar represents an optionally substituted aromatic hydrocarbon group) is converted to an N-acylpyrazoline derivative with high stereoselectivity in the presence of a Lewis acid catalyst or asymmetric Lewis acid catalyst.
US7705161B2
申请人:——
公开号:US7705161B2
公开(公告)日:2010-04-27
Zirconium-Catalyzed Enantioselective [3+2] Cycloaddition of Hydrazones to Olefins Leading to Optically Active Pyrazolidine, Pyrazoline, and 1,3-Diamine Derivatives
作者:Yasuhiro Yamashita、Shū Kobayashi
DOI:10.1021/ja049498l
日期:2004.9.1
conducted in high yields with high enantioselectivities using a chiral zirconium catalyst. These reactions open ways to synthetically and biologically important pyrazoline, pyrazolidine, and 1,3-diamine derivatives. Further, several experiments suggested that the reactions proceeded via concerted pathways.