Novel free radical ring-forming reaction of dichlorocyclobutanones and sequential ring expansion
作者:Paul Dowd、Wei Zhang
DOI:10.1021/ja00051a064
日期:1992.12
Substitution of chlorocyclobutanones with xanthate salts. The remarkable effect of added base
作者:Rama Heng、Béatrice Quiclet-Sire、Samir Z. Zard
DOI:10.1016/j.tetlet.2009.03.133
日期:2009.7
The substitution reaction of chlorocyclobutanones with dithiocarbonates (xanthates) is greatly accelerated by the addition of a mild base such as DABCO or DBU. (C) 2009 Elsevier Ltd. All rights reserved.
Free radical annulation of dichlorocyclobutanones with sequential ring expansion
作者:Paul Dowd、Wei Zhang、Steven J. Geib
DOI:10.1016/0040-4020(95)00093-n
日期:1995.3
reaction of dichloroketene with 1,5-dienes undergo intramolecular freeradical annulation. Lewis acid-promoted ring-opening of the cyclized cyclobutanones then yields novel ringexpansion products. Reaction of (R)-carvone provides an unusual example leading to the formation of a tricyclic dione. The carbonyl group of carvone enhances the radical cyclization and influences the ring-opening pathway.