The Pentaoxa[5]peristylanes. A Novel Oxa-Cage System
摘要:
The synthesis of pentaoxa[5]peristylanes, a novel oxa-cage system, has been accomplished via ozonolysis of 7-anti-2,3-bis-endo-triacylbicyclo[2.2.1]-5-heptenes and via a direct chemical transformation of the tetraacetal tetraoxa-cages 5a-c and 6a-c. (C) 1997 Elsevier Science Ltd.
Aziridination of Activated Imines with Monocarbonyl Iodonium Ylides Generated from (<i>Z</i>)-(2-Acetoxyvinyl)iodonium Salts via Ester Exchange: Stereoselective Synthesis of 2-Acylaziridines
作者:Masahito Ochiai、Yutaka Kitagawa
DOI:10.1021/jo982346m
日期:1999.4.1
Monocarbonyliodoniumylides, generated in situ from (Z)-(2-acetoxyvinyl)iodonium salts via an ester exchange reaction with EtOLi, undergo alkylidene transfer reactions to activated imines yielding 2-acylaziridines in good yields. The stereochemical outcome of this aziridination was shown to be dependent on both the activating groups of the imines and the reaction solvents: that is, the aziridination