Nitroaldol (Henry) reaction catalyzed by amberlyst A-21 as a far superior heterogeneous catalyst.
作者:Roberto Ballini、Giovanna Bosica、Paola Forconi
DOI:10.1016/0040-4020(95)00996-5
日期:1996.1
β-Nitroalcohols can be efficiently obtained with the help of AmberlystA-21, as heterogeneous basic catalyst, with or without solvent. This method is farsuperior to the heterogeneouscatalysts previously reported for the nitroaldol (Henry) reaction, in fact it gives higher yields with primary and secondary nitroalkanes, the formation of by-products such as nitroalkenes is avoited even if aromatic
Reactions of hydroxylated sodium nitronates with acetic anhydride/pyridine
作者:M.V Berrocal、M.V Gil、E Román、J.A Serrano
DOI:10.1016/s0040-4020(02)00487-8
日期:2002.6
Reactions with Ac2O/Py of sodium nitronate salts derived from primary or secondary nitroalkanes bearing hydroxyl groups at γ or more remote positions have been studied. In all cases, the results could be explained through an acetic nitronic anhydride intermediate, whose evolution depends on conformational factors, and also on the type of the hydroxyl group.
已经研究了由γ或更远的位置带有羟基的伯或仲硝基烷烃衍生的亚硝酸钠盐与Ac 2 O / Py的反应。在所有情况下,结果都可以通过乙酸乙酸酐中间体来解释,该中间体的演变取决于构象因素,还取决于羟基的类型。
Michael Addition of Nitroalkanes to Dimethyl Citraconate, with DBU as Base: An Unexpected, One-Pot Synthesis of Polyfunctionalized Carbonyl Derivatives
作者:Roberto Ballini、Luciano Barboni、Giovanna Bosica、Dennis Fiorini、Maria Victoria Gil
DOI:10.1055/s-2002-34209
日期:——
Michael addition of nitroalkanes to dimethyl citraconate, with DBU as base, allows the onepot formation of keto diesters. The reaction proceeds through an equilibrium form of the acceptor, followed by Michael addition ofthe nitroalkane and then, in situ Nef conversion.
Synthesis of the Sterically Fixed Biliverdin Derivative Bearing the<i>Z</i>-<i>anti</i>C/D-Ring Component
作者:Mostafa A. S. Hammam、Yasue Murata、Hideki Kinoshita、Katsuhiko Inomata
DOI:10.1246/cl.2004.1258
日期:2004.10
A sterically locked biliverdin derivative was synthesized by developing an efficient method for the preparation of Z-anti C/D-ring component toward investigation of the stereochemistry and function of the phytochrome chromophores.