Novel Two-Step Synthesis of Homobarrelenones, Bicyclo[3.2.2]nona-3,6,8-trien-2-ones, from Tropones and 2,3-Bis(methoxycarbonyl)-7-oxabicyclo[2.2.1]heptadiene by High-Pressure Cycloaddition-Thermal Cycloreversion Procedure
作者:Guan Rong Tian、Shigeru Sugiyama、Akira Mori、Hitoshi Takeshita
DOI:10.1246/cl.1987.1557
日期:1987.8.5
The Diels–Alderadduct of tropone with 2,3-bis(methoxycarbonyl)-7-oxabicyclo[2.2.1]hepta-2,5-diene formed homobarrelenone by heating at ca. 130 °C. Similarly prepared were 1-hydroxy-, 3-methoxy-, 1-chloro-, and 3-chlorohomobarrelenones. High-pressure cycloaddition improved the yields of the Diels–Alderadducts.