Photoredox Divergent 1,2-Difunctionalization of Alkenes with gem-Dibromides
摘要:
The redox neutral photocatalytic divergent radical 1,2-difunctionalization of a wide array of structurally varied alkenes with gem-dibromides is presented. On the basis of the electronic effect of alkenes, predictable 1,2-carboxygenation and 1,2-carbohalogenation of alkenes are readily available regardless of steric effect. This protocol affords a practical approach to the biologically important furan skeleton. It is distinguished by good regioselectivity, good functional group compatibility, and late-stage modification and thus signifies an important step forward to divergent radical difunctionalization of alkenes.
Photoredox Divergent 1,2-Difunctionalization of Alkenes with gem-Dibromides
摘要:
The redox neutral photocatalytic divergent radical 1,2-difunctionalization of a wide array of structurally varied alkenes with gem-dibromides is presented. On the basis of the electronic effect of alkenes, predictable 1,2-carboxygenation and 1,2-carbohalogenation of alkenes are readily available regardless of steric effect. This protocol affords a practical approach to the biologically important furan skeleton. It is distinguished by good regioselectivity, good functional group compatibility, and late-stage modification and thus signifies an important step forward to divergent radical difunctionalization of alkenes.
Direct synthesis of furans by 3 + 2 cycloadditions between rhodium(II) acetate stabilized carbenoids and acetylenes
作者:Huv M.L. Davies、Karen R. Romines
DOI:10.1016/s0040-4020(01)85968-8
日期:1988.1
Whan appropriate substituents are used, rhodium(II) acatate catalyzed decomposition of diazocarbonyls in the presence of acetylenes results in the formation of furans, derived from dipolar intermediates.