In the presence of Bu3SnH and AIBN, 8-tributylstannyl-6-octen-1-ynes were efficiently cyclized to 2-allyl-1-(tributyl-stannylmethylene)cyclopentanes by intramolecular homolytic allylstannylation. 8-Tributylstannyl-1,6-octadienes as well underwent the radical cyclization in high efficiency. This radical-based method was applicable to the intramolecular vinylstannylation of alkynes and alkenes.
Indium(III) Chloride-Promoted Intramolecular Addition of Allylstannanes to Alkynes
作者:Katsukiyo Miura、Naoki Fujisawa、Akira Hosomi
DOI:10.1021/jo035780j
日期:2004.4.1
In the presence of an equimolar amount of InCl3, 8-tributylstannyl-6-octen-1-ynes (allylstannanes bearing an alkynyl group) were efficiently cyclized to 2-allyl-1-methylenecyclopentanes. In contrast, catalytic use of InCl3 gave 2-allyl-1-(tributylstannylmethylene)cyclopentanes mainly by intramolecular allylstannylation. These cyclizations could proceed via intramolecular addition of an allylindium intermediate.
Intramolecular Carbostannylation of Alkynes Catalyzed by Silver(I) Species