Tetralone Esters as Intermediates for the Synthesis of Podophyllotoxin Derivatives Via Cyclopropanation of Chalcones
作者:N. Nanjundaswamy、S. Shashikanth、C. Anjanamurthy、K. M. Lokanatha Rai
DOI:10.1080/00397910008087138
日期:2000.4
Abstract Cyclopropyl ester (8a-f) were synthesized by the cyclopropanation of chalcones (7a-e) in dry benzene using powdered sodium in 80-85% yield. Preparation of tetralone ester (4a-e), an intermediate for the synthesis of podophyllotoxin derivatives by Lewis acid (SnCl4) catalyzed cyclization of (8a-e) is also described here.