Journal of heterocyclic chemistry

Novel transformations of two kinds of chlorinated photo [2+ 2] cycloadducts of 2??pyrone??5??carboxylate

T Shimo, K Somekawa

文献索引：Shimo, Tetsuro; Date, Kenichi; Somekawa, Kenichi Journal of Heterocyclic Chemistry, 1992 , vol. 29, # 2 p. 387 - 390

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被引用次数: 2

摘要

Abstract Novel reactions of 7, 7-dichloro-and 7, 7, 8-trichloro-3-oxo-2-oxabicyclo [4.2. 0] oct- 4-ene-6-carboxylates 5 with 1, 8-diazabicyclo [5.4. 0] undec-7-ene (DBU) in alcohol gave pyrano [4, 3-b] pyran-2, 5-diones 8 via (Z)-(2H-pyran-2-on-3-yl) butenoates 7. On the other hand, the same treatment of 7, 7, 8-trichloro-2-oxo-3-oxabicyclo-[4.2. 0] oct-4-ene-5- carboxylate 6b afforded 2-oxo-3-oxabicyclo [4.2. 0] oct-4, 7-diene-5-carboxylate 14 via ...