建立了磷腈碱催化氨基烯烃分子内加氢胺化合成异二氢吲哚的方法。该反应具有广泛的官能团耐受性,包括卤化物、氰基和甲氧基,也可用于合成四氢异喹啉、吡咯烷和哌啶。该方法被用作马兜铃碱全合成的关键步骤,分六步进行,总产率为 35%。该策略涉及通过控制所需 C N 键的形成来构建异二氢吲哚核心,而相对不稳定的甲氧基甲基和芳基溴保持完整。
A versatile approach to the synthesis of 4,5-dioxoaporphine and 3,4-dioxocularine alkaloids. One-Pot sequential ring formation from arylacetamides
作者:Rafael Suau、Juan Manuel López-Romero、Rodrigo Rico
DOI:10.1016/s0040-4039(97)82963-2
日期:1996.12
Cyclization of biarylacetamides to their phenanthrene derivatives is promoted by oxalyl chloride/stannyl chloride. The reaction proceeds with a second cyclization in which the oxalyl fragment acts as an alpha-dicarbonyl transfer agent to give 4,5-dioxoaporphine alkaloids in a single step. This double cyclization was also applied to aryloxyphenyl acetamides to give the corresponding 3,4-dioxocularine alkaloids. Decarbonylated aristocularine alkaloids were also formed in this case. Copyright (C) 1996 Elsevier Science Ltd
LAMAS, CARLOS;CASTEDO, LUIS;DOMINGUEZ, DOMINGO, TETRAHEDRON LETT., 31,(1990) N3, C. 6217-6218