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