Regiospecific Michael reaction of (+)-euryfuran with activated 1,4-benzoquinones
作者:Jaime A Valderrama、Manuel Cortés、David Pessoa-Mahana、Marcelo Preite、Julio Benites
DOI:10.1016/s0040-4039(00)00463-9
日期:2000.5
(+)-Euryfuran cycloadds regiospecifically to activated monosubstituted 1,4-benzoquinones under mild conditions to give the corresponding Michael adducts which, depending on the quinone substituent, undergo in situ redox reactions to the respective euryfurylbenzoquinones. One of the reported Michael adducts undergoes a facile stereoselective cyclisation under oxidant conditions to afford a naphthofuro[4,3-c]benzopyran derivative. The regiospecificity of the Michael and cyclisation reactions are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.
Studies on quinones. Part 35: Access to antiprotozoal active euryfurylquinones and hydroquinones
作者:Jaime A. Valderrama、Julio Benites、Manuel Cortés、David Pessoa-Mahana、Eric Prina、Alain Fournet
DOI:10.1016/s0040-4020(01)01186-3
日期:2002.1
(+)-Euryfuran adds regiospecifically to activated monosubstituted 1,4-benzoquinones under mild conditions to give the corresponding Michael adducts which, depending on the quinone substituent, undergo in situ redox reactions to the respective euryfuryl-benzoquinones. One of these Michael adducts undergoes a facile stereoselective cyclisation under oxidant conditions to afford a naphthofuro[4,3-c]benzopyran derivative. The in vitro activities of the obtained euryfurylquinones and hydroquinones against Leishmania amazonensis are described. (C) 2002 Elsevier Science Ltd. All rights reserved.