Synthesis of 4,5-Benzotropones by Cyclization of 1,3-Bis-Silyl Enol Ethers with 1,2-Dialdehydes
作者:Uwe Albrecht、Thi Hong Van Nguyen、Peter Langer
DOI:10.1021/jo049736v
日期:2004.5.1
The cyclization of 1,3-bis-silylenolethers 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.