Synthesis of 4,5-benzotropones by cyclization of 1,3-bis-silyl enol ethers with 1,2-dialdehydes.
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.
Albrecht
Uwe
U
Institut für Chemie und Biochemie der Ernst-Moritz-Arndt Universität Greifswald, Soldmannstr. 16, D-17487 Greifswald, Germany.
Nguyen
Thi Hong Van
TH
Langer
Peter
P