Butenolide annelation using a manganese(III) oxidation. A synthesis of chromolaenin (Laevigatin)
作者:Ayhan S Demir、Zuhal Gercek、Nese Duygu、A Cigdem Igdir、Omer Reis
DOI:10.1139/v99-136
日期:1999.8.1
butenolide to an aromatic ketone that highlighted a manganese(III) oxidation of an aromatic ketone. The merit of this procedure was illustrated in a synthesis of Chromolaenin (Laevigatin) (1) from 4,7-dimethyl-1-tetralone (2c). Oxidation of tetralone and indanone with manganese(III) acetate in the presence of chloro- or bromopropionic acid or their Mn(II) salts furnished a α-haloesters 3a-d. An Arbuzov
开发了一种将丁烯内酯退火成芳香酮的程序,该程序突出了芳香酮的锰 (III) 氧化。该程序的优点在从 4,7-二甲基-1-四氢萘酮 (2c) 合成 Chromolaenin (Laevigatin) (1) 中得到了说明。在氯丙酸或溴丙酸或其 Mn(II) 盐的存在下,四氢萘酮和茚满酮与乙酸锰 (III) 的氧化得到 α-卤代酯 3a-d。卤代酯与亚磷酸三乙酯的 Arbuzov 反应和所得膦酸酯的分子内 Horner-Watsworth-Emmons 环化得到丁烯内酯 5a、b,产率为 77-79%。该方法也适用于 4,7-二甲基-1-四氢萘酮 (2c),相应的丁烯内酯 6 以 85% 的产率合成,然后使用 DIBAL-H 将其转化为 Chromolaenin (1)。拉维加汀),