Synthesis of 3-substituted isocoumarins and related natural products.
作者:Shunsaku OHTA、Yasuhiro KAMATA、Takayo INAGAKI、Yukari MASUDA、Satoshi YAMAMOTO、Masayuki YAMASHITA、Ikuo KAWASAKI
DOI:10.1248/cpb.41.1188
日期:——
Several N, N-diethyl-2-acylmethylbenzamides (6) were prepared from N, N-diethyl-2-toluamides (4), and the ketoamides (6) were easily cyclized to the corresponding 3-substituted isocoumarins (8) by heating in acetic acid or xylene. This simple procedure was applied to the synthesis of thunberginol A (1), thunberginol B (2), thunberginol F (14), and a key-intermediate (8j) for achlisocoumarin I (3).
几种N,N-二乙基-2-酰基甲基苯胺(6)是从N,N-二乙基-2-甲苯酰胺(4)制备而成的,这些酮胺(6)可以通过在醋酸或二甲苯中加热轻松环化为相应的3取代异香豆素(8)。这一简单的步骤被应用于青藏醇A(1)、青藏醇B(2)、青藏醇F(14)以及达克异香豆素I(3)的一个关键中间体(8j)的合成。