Cyclopentannulation on 3-phospholenes: an expedient route to the 2-phosphabicyclo[3.3.0]octene ring system
作者:Zbigniew Pakulski、Renata Kwiatosz、K.Michał Pietrusiewicz
DOI:10.1016/s0040-4039(03)01296-6
日期:2003.7
yield. The annulation reactions are highly regio- and stereoselective and lead to the formation of exo-Ph-P substituted products exclusively. Reduction of the resulting bicyclic phosphine oxides by phenylsilane gives the corresponding phosphines with complete retention of configuration at P. Application of this annulation procedure to acyclic allylic substrates leads to the corresponding monocyclic
用2当量处理1-苯基-3-膦烯衍生物。LDA的制备,然后用1,3-二卤代烷烃淬灭金属化的中间体,以良好的收率得到2-磷酸双环[3.3.0]辛-3-烯衍生物。环化反应具有高度的区域选择性和立体选择性,并且仅导致形成外-Ph-P取代的产物。通过苯基硅烷还原所得的双环膦氧化物得到相应的膦,其在P处的构型得以完全保留。将该环化方法应用于无环烯丙基的底物可得到相应的单环环化产物。