Synthesis of Tertiary Cyclobutanols through Stereoselective Ring Expansion of Oxaspiropentanes Induced by Grignard Reagents
作者:Angela M Bernard、Costantino Floris、Angelo Frongia、Pier P Piras
DOI:10.1016/s0040-4020(00)00369-0
日期:2000.6
The stereoselectivity of the ringexpansion of oxaspiropentanes to cyclobutanols induced by Grignard reagents has been studied. It has been found that the reaction occurs through the intermediacy of a cyclobutanone, formed stereospecifically, whereas the attack of the Grignard reagent on the carbonyl group of the cyclobutanone is stereospecific only in the case of the oxaspiropentanes derived from
A New Synthesis of Alkylidenecyclopropanes by the Julia-Lythgoe-type Olefination Using Sulfones and Sulfoxides
作者:Angela M. Bernard、Pier Paolo Piras、Angelo Frongia、Francesco Secci
DOI:10.1055/s-2004-822899
日期:——
The first use of the Julia-Lythgoe-type olefination with cyclopropylsulfones and cyclopropylsulfoxides for the synthesis of alkylidenecyclopropanes is reported.