Andrew G. Brewster, Christopher S. Frampton, Mark B. Mitchell, Jay Jayatissa, Richard J. Stoodley and Shaheen Vohra
Essentially complete retention of configuration accompanies the base-induced aldol reaction of the thiazolidinecarboxylate 6c to give the fused heterocycles 7c and 8c and their retroaldol–acylation reactions to give the bicycle 9c.