One-Pot Synthesis of Spiro Isochromane-3,3′-piperidines, -3,4′-piperidines and -3,3′-pyrrolidines
作者:J. W. Butcher、D. A. Claremon
DOI:10.1055/s-1993-25832
日期:——
Spiro isochromane-1-ones 1 were treated with lithium aluminum hydride or Grignard reagents to afford diol intermediates 2, which cyclize in 85 % phosphoric acid at 100°C to spiro isochromanes 3 in 72-94 % isolated yields.
Spiro异香豆酮-1-酮1与锂铝氢化物或Grignard试剂反应,得到二醇中间体2,然后在100°C的85%磷酸中环化,生成spiro异香豆烯3,分离产率为72-94%。