Cyclobutenediones as precursors to quinones and cyclopentenones
作者:Lanny S. Liebeskind
DOI:10.1016/s0040-4020(01)80131-9
日期:1989.1
An improved method for the synthesis of substituted cyclobutenediones
作者:Lanny S. Liebeskind、Richard W. Fengl、Kevin R. Wirtz、Thomas T. Shawe
DOI:10.1021/jo00246a017
日期:1988.5
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.
Erratum to ‘Formation of 2-halomethylene-4-cyclopentene-1,3-diones and/or 2-halo-1,4-benzoquinones via ring-expansion of 4-ethynyl-4-hydroxy-2,3-substituted-2-cyclobuten-1-ones. Total synthesis of methyl linderone’ [Tetrahedron 69 (2013) 9284–9293]
作者:Hong Yin、Shubhada W. Dantale、Novruz G. Akhmedov、Björn C.G. Söderberg