... J. Heterocyclic Chem., 29, 1101 (1992). 1101 Introduction. ... In the structure of 60, 61 the /J-ketone ester was totally trans- ferred to enol ester in deuterated DMSO. ... The solution was stirred under reflux for 6 Page 6. 1106 К. Sung and A.-R. Lee Vol. ...