The cyclosulfonylation reaction: A comment on the radical reactions of 4-pentenyl tosylate
摘要:
Attempted free radical rearrangement of the para-toluenesulfonyl ester of 4-penten-1-ol in carbon tetrachloride gives only the simple Kharasch 1,2-adduct, instead of the 2-substituted tetrahydrofuran as claimed by Serra and da Silva Correa.
Two efficient procedures involving tin hydride or thiophenol-mediated intramolecular homolytic substitution at the sulfur atom are reported. They lead to the generation of varied P(V)-centered radicals from the corresponding aryl or alkyne thiophosphorus substrates. The radical formed can be trapped by an olefin via an intermolecular addition, leading to the construction of C–P bonds. Thiophosphination
An interesting rearrangement of unsaturated sulphonate and thiosulphonate esters
作者:Arménio C. Serra、Carlos M.M. da Silva Corrêa
DOI:10.1016/0040-4039(91)80246-3
日期:1991.11
Alkenyl tosylates and thiotosylates, in the presence of radical initiators, undergo radical rearrangements to the corresponding tetrahydrofuran and tetrahydrothiophen derivatives.