Reddy, D. Bhaskar; Reddy, M. Muralidhar; Subbaraju, Gottumukkala V., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1995, vol. 34, # 9, p. 816 - 822
Some bisheterocycles having pyrrole and oxazoline/thiazoline units were synthesized from Z-styrylsulfonylacetic acid methyl esters using samarium chloride.
A newclass of spiro heterocycles viz., spiropyrazolidinediones, isoxazolidinediones, pyrimidinetriones or thioxopyrimidinediones are developed from methyl 3-aryl-2-(Z-arylethenenylsulfonyl)acrylate by double Michael addition reaction with dimethyl malonate followed by cyclocondensation with appropriate nucleophiles.