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 ring expansion 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
研究了格列雅试剂对氧杂螺环戊烷对环丁醇的扩环立体选择性。已经发现该反应通过立体定向形成的环丁酮的中间发生,而格氏试剂对环丁酮羰基的攻击仅在醛衍生的氧杂螺环戊烷的情况下是立体定向的。