One-Pot Reaction Sequence: <i>N</i>-Acylation/Pictet–Spengler Reaction/Intramolecular [4 + 2] Cycloaddition/Aromatization in the Synthesis of β-Carboline Alkaloid Analogues
作者:Kseniya A. Alekseeva、Milana A. Fedoseeva、Olga V. Bakhanovich、Victor N. Khrustalev、Vladimir I. Potkin、Hongwei Zhou、Eugenia V. Nikitina、Vladimir P. Zaytsev、Fedor I. Zubkov
DOI:10.1021/acs.joc.3c02533
日期:2024.3.1
One-pot synthesis of tetrahydro-β-carbolines, fused with an isoindole core, was proposed starting from maleic anhydride and azomethines easily available from tryptamines and 3-(hetaryl)acroleins. This sequence includes four key steps: an acylation of the aldimine with maleic anhydride, a Pictet–Spengler cyclization, an intramolecular Diels–Alder reaction, and a concluding [1,3]-H shift. As a result
提出以马来酸酐和甲亚胺为起始原料,一锅法合成与异吲哚核稠合的四氢-β-咔啉,而甲亚胺很容易从色胺和3-(杂芳基)丙烯醛中获得。该序列包括四个关键步骤:醛亚胺与马来酸酐的酰化、Pictet-Spengler 环化、分子内 Diels-Alder 反应以及最终的 [1,3]- H位移。结果,以非对映选择性方式形成六核或七核生物碱样杂环系统,其中包含与呋喃、噻吩或吡咯成环的苯并[1,2]吲嗪并[8,7- b ]吲哚片段。