Synthesis of 4,5-benzotropones by cyclization of 1,3-bis-silyl enol ethers with 1,2-dialdehydes |
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| Authors: | Albrecht Uwe Nguyen Thi Hong Van Langer Peter |
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| Institution: | Institut für Chemie und Biochemie der Ernst-Moritz-Arndt Universit?t Greifswald, Soldmannstr. 16, D-17487 Greifswald, Germany. |
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| Abstract: | The cyclization of 1,3-bis-silyl enol ethers or (2,4-dioxobutylidene)triphenylphosphoranes with phthalic dialdehyde allowed a convenient synthesis of a variety of 4,5-benzotropones. The hydrogenation of benzotropones afforded functionalized benzocycloheptanones which were transformed into tricyclic butenolides. |
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