One Pot Synthesis of Cyclobutanols by Ring Expansion of Oxaspiropentanes Induced by Grignard Reagents
作者:Angela M. Bernard、Costantino Floris、Angelo Frongia、Pier P. Piras
DOI:10.1055/s-1998-1730
日期:1998.6
Aromatic, aliphatic and vinylic Grignard reagents efficiently catalyze the ring expansion of oxaspiropentanes 2 a,b to give, in one pot, good yields of cyclobutanols 3 a, 3 b - 7 b. Benzyl magnesium chloride gives a mixture of cyclobutanols and the cyclopropanol 8, probably coming from a direct nucleophilic attack on the epoxide part of the oxaspiropentane.
芳香族、脂肪族和乙烯基格氏试剂可有效催化氧杂螺戊烷 2 a,b 的环扩张,从而在一锅内获得高收率的环丁醇 3 a, 3 b - 7 b。苄基氯化镁可生成环丁醇和环丙醇 8 的混合物,这可能是由于氧杂螺戊烷的环氧化物部分直接发生亲核攻击所致。