Synthesis of .gamma.- and .delta.-lactones by free-radical annelation of Se-phenyl selenocarbonates
作者:Mario D. Bachi、Eric Bosch
DOI:10.1021/jo00043a030
日期:1992.8
A general method for the synthesis of gamma- and delta-lactones through the intramolecular addition of alkoxycarbonyl radicals, formed by reaction of Se-phenylselenocarbonates with n-Bu3SnH, onto carbon-carbon multiple bonds is described. This free-radical cyclization is characterized by high regioselectivity favoring exo addition and by a high ratio of cyclization to reduction. Monocyclic, fused bicyclic, and spirocyclic lactones are formed in good to excellent yield. Use of allyltri-n-butyltin as a chain-transfer agent in the place of n-Bu3SnH affords the corresponding 3-butenyl lactones.
Bachi, Mario D.; Bosch, Eric, Heterocycles, 1989, vol. 28, # 2, p. 579 - 582
作者:Bachi, Mario D.、Bosch, Eric
DOI:——
日期:——
Synthesis and Mechanistic Study of Fused 2-Pyrrolines via Thermolysis of 6-Substituted-3,5-hexadienyl Azidoformates
作者:Pei-Lin Wu、Ta-Hsien Chung、Ying Chou
DOI:10.1021/jo010218j
日期:2001.10.1
6-substituted-3,5(Z)-hexadienyl azidoformates produced a cis and trans mixture. The mechanism was proposed as the loss of nitrogen to form an acyl nitrene, then addition to a double bond to produce an aziridine. Finally the cleavage of the C-C bond generated a vinylazomethine ylide followed by recyclization to a fused 2-pyrroline.