CoII-tetraphenylporphyrin-catalyzed decomposition of bicyclic endoperoxides 4 and 5 with a strained double bond moiety has been studied. Compounds 4 and 5 have been synthesized by photooxygenation of 3 which itself was obtained by dichloroketene addition to cycloheptatriene, followed by removal of the chlorine atoms. An unusualdecompositionmode of 4 promoted by CoII-TPP resulted in the formation
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.