Allenyl allylic ethers: synthesis and thermal rearrangements
摘要:
Application of the sequence halogenation/dehydrohalogenation/isomerization to alkenes 1a-g affords allenyl allylic ethers 5a-g. Thermal isomerizations of 5a,d,e proceed by Claisen rearrangement, while 5b,c,f,g are transformed by alternate modes of [2 + 2]cycloaddition involving biradical intermediates of type 19 to polycyclic structures; the variations in these thermal isomerizations are mainly a function of ring size.
A radical cyclisation route to α-methylene-γ-butyrolactones
作者:Adusumilli Srikrishna
DOI:10.1039/c39870000587
日期:——
A three-step synthesis of α-methylene-β-butyrolactones is described, via radicalcyclisation of 2-bromoalkyl prop-2-ynyl ethers (5) to 3-methylenetetrahydrofurans (6) using a tin catalyst.
Electrooxidative initiation of tin hydride-promoted radical chain reactions
作者:Hideo Tanaka、Hiroaki Suga、Hidenori Ogawa、A.K.M. Abdul Hai、Sigeru Torii、Anny Jutand、Christian Amatore
DOI:10.1016/s0040-4039(00)79024-1
日期:1992.10
Electrooxidative initiation of tin hydride-promoted radicalchainreactions at ambient temperature has been performed by passing 0.2–0.5 F/mol of electricity through a solution of triphenyltin hydride and substrates in THF containing Bu4NClO4.
氢化锡促进的自由基链反应在环境温度下的电氧化引发反应是通过使0.2–0.5 F / mol的电流通过氢化三苯锡和底物在含有Bu 4 NClO 4的THF中的溶液进行的。
A synthetic route to allenylidene tetrahydrofurans
作者:Jean-Pierre Dulcère、Estelle Dumez、Robert Faure
DOI:10.1039/c39950000897
日期:——
Radical mediated carbocyclization of bromoalkynyloxiranes 4 affords allenylidenetetrahydrofurans 5via a new α-hydroxyallene-terminated cyclization.