Synthesis of Functionalized 2-Alkylidene-tetrahydrofurans Based on a [3+2] Cyclization/Bromination/Palladium(0) Cross-Coupling Strategy
作者:Esen Bellur、Peter Langer
DOI:10.1002/ejoc.200500422
日期:2005.11
The bromination of 2-alkylidene-tetrahydrofurans and 2-alkylidene-pyrrolidines — readily available through one-pot [3+2] cyclization reactions — afforded 2-alkylidene-1′-bromotetrahydrofurans, 2-alkylidene-3-bromotetrahydrofurans and 2-alkylidene-1′,3-dibromotetrahydrofurans and their pyrrolidine counterparts. 2-Alkylidene-1′-bromotetrahydrofurans were functionalized by performing Suzuki and Heck reactions
Synthesis of Benzofurans with Remote Bromide Functionality by Domino “Ring-Cleavage-Deprotection-Cyclization” Reactions of 2-Alkylidenetetrahydrofurans with Boron Tribromide
作者:Esen Bellur、Peter Langer
DOI:10.1021/jo051079z
日期:2005.9.1
Bromination and subsequent Suzuki reactions of 2-alkylidenetetrahydrofurans, readily available by [3+2] cyclizations, afforded 1‘-(2‘ ‘-methoxyphenyl)-2-alkylidenetetrahydrofurans. Treatment of the latter with borontribromide and subsequent addition of water resulted in the chemoselective formation of functionalized benzofurans containing a remote bromide functionality. The products are formed by
Functionalization of 2-Alkylidenetetrahydrofurans and 2-Alkylidenepyrrolidines by Palladium(0)-Catalyzed Cross-Coupling Reactions
作者:Peter Langer、Esen Bellur
DOI:10.1055/s-2004-830892
日期:——
2-Alkylidenetetrahydrofurans and 2-alkylidenepyrrolidines were efficiently functionalized by bromination of the exocyclic double bond and subsequent palladium-catalyzed cross-coupling reactions.