Highly efficient terpenoid pheromone syntheses via regio- and stereocontrolled processing of allyllithiums generated by reductive lithiation of allyl phenyl thioethers
作者:Dennis W. McCullough、M. Bhupathy、Elvio Piccolino、Theodore Cohen
DOI:10.1016/s0040-4020(01)80712-2
日期:1991.12
Previous work had shown that reductive lithiation of allyl phenyl thioethers, followed by transmetallation, produces allylmetallics which react selectively with carbonyl compounds at the most or least substituted terminus; the latter results in mainly cis olefin. This technology allows extremely efficient syntheses of racemic versions of lavandulol (two-pot, 70% yield), the Comstock mealy bug pheromone (one-pot, 45% yield) and the California red scale pheromone (4-steps, 23% yield).
Radical [<i>n</i> + 1] Annulations with Sulfur Dioxide
作者:Anna Tsimelzon、Rebecca Braslau
DOI:10.1021/jo052035t
日期:2005.12.1
A new methodology for [n + 1] radical annulation using sulfurdioxide as a geminal radical acceptor/donor is presented. This methodology provides a novel route to the formation of five-, six-, and seven-membered cyclic sulfones utilizing a radical chain mechanism under very mild conditions.
提出了一种使用二氧化硫作为双基自由基受体/供体的[ n +1]自由基环化的新方法。这种方法学为在非常温和的条件下利用自由基链机理形成五元,六元和七元环状砜提供了一条新颖的途径。