A short divergent approach to highly substituted carbazoles and β-carbolines via in situ-generated diketoindoles
作者:Martin Untergehrer、Franz Bracher
DOI:10.1016/j.tetlet.2020.151597
日期:2020.3
an aza-alkylation/Michael addition cascadereaction developed by Kim and co-workers we have developed divergent cascadereactions leading to either highly substituted 1-hydroxycarbazoles, 3-hydroxycarbazoles or β-carbolines, starting from readily accessible ortho-arylsulfonylaminobenzaldehydes. Olefination of the aldehyde functionality by aldol condensation or Wittig olefination gave reactive enone intermediates
Synthesis of methylene cyclopropane-fused chromenes and dihydroquinolines by sequential [4 + 2]- and [1 + 2]-annulation
作者:Tianyu Lu、Xuange Zhang、Zhiwei Miao
DOI:10.1039/d0ob00389a
日期:——
A base promoted sequential [4 + 2]- and [1 + 2]-annulation of 2-hydroxychalcones or 2-tosylaminochalcones with prop-2-ynylsulfonium salts has been developed to give the corresponding methylene cyclopropane fused dihydroquinolines or chromenes in moderate to good yields. This transformation has advantage of wide substrate scope and functional group tolerance as well as excellent regioselectivity. Prop-2-ynylsulfonium
Synthesis of 1,4‐Disubstituted and 1‐Substituted β‐Carbolines via 3‐Substituted 2‐Acylindoles
作者:Katharina Thees、Martin Untergehrer、Ilya A. P. Jourjine、Franz Bracher
DOI:10.1002/ejoc.202400124
日期:2024.5.21
Convenient methods are reported for the synthesis of 1,4-disubstituted and 1-substituted β-carbolines from 3-substituted 2-acylindoles, which are accessible through two one-pot multistep reactions via oxomethylated benzenesulfonamide intermediates. The acylindoles are subsequently subjected to aminomethylenation with formamide derivatives or chemoselective reduction, followed by ring closure with ammonium