Ring Synthesis by Stereoselective, Methylene-Free Enyne Cross Metathesis
摘要:
Tandem enyne metathesis between 1-alkynes and 1,5-cyclooctadiene or all-cis-1,4-polybutadiene resulted in a direct, one-step ring synthesis of cyclohexadienes by methylene-free metathesis. The use of methylene-free metathesis conditions provided apparent Z-selectivity in the intermolecular enyne metathesis step.
作者:Daniel A. Clark、Joseph R. Clark、Steven T. Diver
DOI:10.1021/ol800523j
日期:2008.5.1
Allyl alcohols and their homologues were used in the enyne cross metathesis to prepare hydroxy-functionalized dienes. An isomerization was found to occur under prolonged heating, and a method for conversion to ( E)-diene product is also reported.
Cycloheptadiene Ring Synthesis by Tandem Intermolecular Enyne Metathesis
作者:Amol A. Kulkarni、Steven T. Diver
DOI:10.1021/ol035246y
日期:2003.9.1
[GRAPHICS]The tandem intermolecular enyne metathesis between 1-alkynes and cyclopentene is reported, providing 2-substituted 1,3-cycloheptadienes. The success of the intermolecular reaction hinges on an appropriate balance between cycloalkene ring strain and reactivity of the alkyne.