Vinyl halides containing vinylic and allylic silane terminators undergo a stereospecific palladium(0)-catalyzed cross-coupling with derivatives of terminal propargylic and homopropargylic alcohols to polyunsaturated silanes. Basic stable and unstable protecting groups were tolerated under slightly different reaction conditions.
The use of rieke zinc metal in the selective reduction of alkynes
作者:Whe-Narn Chou、David L. Clark、James B. White
DOI:10.1016/s0040-4039(00)92612-1
日期:1991.1
Rieke zinc has been found to be a very selective reducing agent of alkynes to cis-alkenes, allowing for the reduction of enynes to 1,3-dienes, diynes to enynes or dienes, and of propargylic alcohols to cis-allylic
The use of trans-2,3-divinyl epoxides as precursors to carbonyl ylides
作者:Whe-Narn Chou、James B. White
DOI:10.1016/0040-4039(91)80552-h
日期:1991.12
3-Divinyl epoxides have been found to be good substrates for the generation of carbonylylides in CCl4 and 145 °C. These ylides, to a limited extent, undergo isomerization to cis-2,3-divinyl epoxides, leading to the isolation of 4,5-dihydrooxepins. Of greater potential usefulness is the finding that these ylides can be efficiently trapped in an intermolecular sense by a dipolarophile, leading to dihydrofurans