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.
A NEW AND EFFICIENT SYNTHESIS OF INDENONE
作者:Mustafa Zengin、Arif Daştan、Metin Balci
DOI:10.1081/scc-100104416
日期:2001.1
Reaction of dichloroketone 2 with NEt3 gave indenone (4) in high yield. Catodic reaction of 2 in the presence of C/Pt electrodes afforded the rearranged product 3 in high yield besides a small amount of chlorohydroxyketone 5. Reaction of rearranged dichloroketone 3 with NEt3 provided indenone (4) as the sole product. The mechanism of these reaction was discussed.