Regioselective alkylation reactions of hydrazones derived from phosphine oxides and phosphonates. Synthesis of phosphorus substituted 1-amino-pyrrolones, pyridinones and pyrroles
摘要:
Functionalized hydrazones derived from phosphine oxides or phosphonates were obtained from azaenolates of hydrazones and alkyl halides. The regioselectivity of alkylation of a-phosphorylated hydrazones can be controlled by phosphorus moiety. alpha -Alkylated compounds were used for the synthesis of heterocycles such as 1-aminopyrrol-2-ones, 1-amino-3,4-dihydropyridin-2-ones and 1-amino-pyrroles containing phosphinyl or phosphoryl substituents. (C) 2001 Elsevier Science Ltd. All rights reserved.
Easy and Efficient Generation of Reactive Anions with Free and Supported Ylides as Neutral Brønsted Bases
作者:Francisco Palacios、Domitila Aparicio、Jesús M de los Santos、Antoine Baceiredo、Guy Bertrand
DOI:10.1016/s0040-4020(99)01039-x
日期:2000.1
The tris(dimethylamino)-C-dimethylphosphorus ylide 5 and the tris(dimethylamino)phosphorus ylide C-bound to Merrifield's resin 6 are used as strong non-nucleophilic bases in N-alkylation reactions of β-amino phosphine oxides and α-amino acid derivatives, and in the C-alkylation reaction of enamines and benzophenone imines derived from glycine ethyl ester. Base-catalyzed aldol-type condensation (Henry)
三(二甲基氨基) - c ^ -dimethylphosphorus叶立德5和三(二甲基氨基)磷叶立德Ç到的Merrifield的树脂结合的6在用作强的非亲核性碱Ñ β氨基膦氧化物和α -氨基酸的烷基化反应衍生物,以及在烯胺和二苯甲酮亚胺的C-烷基化反应中衍生自甘氨酸乙酯。还描述了硝基乙烷与醛的碱催化的醛醇缩合(亨利)反应以及氧化膦和膦酸酯的烯化反应。