Stepwise and one-pot cross-coupling–heteroannulation approaches toward 2-substituted C5-, C6-, and C7-nitroindoles
摘要:
A general and efficient synthesis of 2-substituted C5-, C6-, and C7-nitroindoles has been established. Starting from commercially available 2-amino nitrophenols, C5-, C6-, and C7-nitroindoles were synthesized via the stepwise Pd-catalyzed cross-coupling of nitro 2-trifloxyanilides with 1-alkynes followed by the t-BuOK-mediated heteroannulation. A Pd-catalyzed one-pot coupling-heteroannulation procedure was carried out by using nitro 2-trifluoroacetamidoaryl triflates. (C) 2004 Elsevier Ltd. All rights reserved.
Chemistry of aminophenols. Part 2: A general and efficient synthesis of indoles possessing a nitrogen substituent at the C4, C5, C6, and C7 positions
作者:Wei-Min Dai、Li-Ping Sun、Dian-Shun Guo
DOI:10.1016/s0040-4039(02)01851-8
日期:2002.10
efficient synthesis of indoles possessing a nitrogen substituent at the C4, C5, C6, and C7 positions has been developed. Starting from commercially available nitro 2-aminophenols, 5-, 6-, and 7-arenesulfamoylindoles were synthesized via a base-promoted ring closure of 2-alkynylanilides, reduction of the nitrogroup, and sulfonylation. C4 nitrogen substituted indoles were synthesized from 2-chloro-1,3-dinitrobenzene