Pd/C-Catalyzed Cyclizative Cross-Coupling of Two<i>ortho</i>-Alkynylanilines under Aerobic Conditions: Synthesis of 2,3′-Bisindoles
作者:Bo Yao、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201501020
日期:2015.5.11
A palladium‐catalyzed cyclizative cross‐coupling of two o‐alkynylanilines to 2,3′‐bisindoles underaerobic oxidative conditions was developed. Mechanistic studies suggested that the two catalytic cycles, namely the formation of 3‐alkynylindoles 8 and their subsequent cyclization to bisindoles 5, are temporally separated. The aminopalladation of 3‐alkynylindoles 8 occurred only after all the N,N‐di
A novel entry to cyclopenta[b]quinolines via thermal ring-expansion of (2-aminophenyl)-ethynyl-substituted squaric acid derivatives
作者:Peter S. Zehr、Reem Kayali、Eduardo Peña-Cabrera、Omar Robles-Resendiz、Alma D. Villanueva-Rendon、Björn C.G. Söderberg
DOI:10.1016/j.tet.2008.03.025
日期:2008.5
Substituted cyclopenta[b]quinolin-1-ones were prepared by thermal ring-expansion of substituted N-Boc protected 4-(2-aminophenylethynyl)-4-hydroxy-2-cyclobuten-1-ones forming the corresponding 2-aminophenylmethylidene substituted 4-cyclopentene-1,3-diones. Deprotection of the amine resulted in spontaneous condensation giving cyclopenta[b]quinolin-1-ones. Sodium borohydride reduction of these products produced cyclopenta[b]quinolin-1-ols. (C) 2008 Elsevier Ltd. All rights reserved.