A facile phase transfer catalyzed-michael addition of ethyl α (P-tolylsulfonyl)acetate to α(P-tolylsulfonyl)acetate to α,β-unsaturated esters
ZHANG ZHENG;LIU GUANGJIAN;WANG YULIANG;XU CONGYING;HU LIANGBIN
Chin. J. Org. Chem. . 1990, (5): 422 -426 .