A Convenient Preparation of 4-Carboxamide Derivatives of Pyridazino[4,5-<i>b</i>]indoles and Pyridazino[4,5-<i>b</i>]benzo[<i>b</i>]furans
作者:José C. González-Gómez、Eugenio Uriarte
DOI:10.1055/s-2002-35569
日期:——
Diels-Alder reaction of indole or 3-coumaranone with 3,6-dicarbomethoxy-1,2,4,5-tetrazine followed by MgCl 2 -mediated C-4 regioselective amidation of the tricyclic diester and subsequent Krapcho dealkoxycarbonylation, provided a convenient route to 4-carboxamide derivatives of pyridazino]4,5-b]indoles and pyridazino]4,5-b]benzo]b]furans. 1,4-Biscarboxamide derivatives were also obtained by full amidation
吲哚或 3-香豆酮与 3,6-二碳甲氧基-1,2,4,5-四嗪的 Diels-Alder 反应,然后是 MgCl 2 介导的三环二酯的 C-4 区域选择性酰胺化和随后的 Krapcho 脱烷氧基羰基化,提供了一条方便的途径哒嗪基]4,5-b]吲哚和哒嗪基]4,5-b]苯并]b]呋喃的4-甲酰胺衍生物。1,4-双甲酰胺衍生物也可通过二酯中间体与过量胺的完全酰胺化获得。