ChemInform Abstract: Novel Transformations of Two Kinds of Chlorinated Photo (2 + 2) Cycloadducts of 2‐Pyrone‐5‐carboxylate.

Abstract

Novel Transformations of Two Kinds of Chlorinated Photo (2 + 2) Cycloadducts of 2-Pyrone-5-carboxylate.-DBU treatment of the photoproducts (III) leads to the compounds (V) via dehydrochlorination, retro-aldol reaction and lactonization. Treatment of the photoproduct (IVb) with DBU yields the compound (VII) via dehydrochlorination. -(SHIMO, T.; DATE, K.; SOMEKAWA, K.; J. Heterocycl. Chem. 29 (1992) 2, 387-390; Dep. Appl. Chem. Chem. Eng., Fac. Eng., Kagoshima Univ., Korimoto, Kagoshima 890, Japan; EN)