在无溶剂条件下负载于氧化铝上的CeCl 3 ·7H 2 O / NaI系统促进的贫电子烯烃的杂原子亲核加成反应
摘要:
杂原子亲核试剂与强吸电子基团共轭的碳-碳双键的共轭加成是合成有机化学中最重要的新成键策略之一。在这些迈克尔加成方法中,路易斯酸已显示出最佳的启动子活性,特别是,浸渍在无机载体上的试剂的使用正在迅速增加。随着化学研究中环境意识的增强,无溶剂迈克尔的加入引起了我们的关注。在我们正在进行的利用三氯化铈开发合成方案的计划的继续中,我们报告了CeCl 3 ·7H 2的扩展O / NaI组合在无溶剂条件下得到支持,以促进杂原子迈克尔的加成。使用中性氧化铝(Al 2 O 3)作为固体载体可以避免某些与无机载体为硅胶的过程相关的问题。CeCl 3 ·7H 2 O / NaI / Al 2 O 3该系统对于利用弱亲核试剂(例如咪唑和氨基甲酸酯)的杂配迈克尔加成反应很好,并且在不同于α,β-不饱和羰基化合物的迈克尔受体的情况下,反应也以良好的收率进行。该方法的重要合成应用是生产4-哌啶酮衍生物时的分子内氮杂-
A general method is described for the synthesis of 3-aminopiperidines from 4-piperidones based on a KOEt treatment of the tosylate of the corresponding oximes (Neber rearrangement). The procedure is applied to the synthesis of N-benzyl-3-amino-4,4-diethoxypiperidine (13), (R)-N-(2-hydroxy-1-phenyl)ethyl analogues 18, and 2-phenyl derivatives 27–28. The methoxybenzylation of the primary amino group
Cui, Li; Peng, Yu; Zhang, Liming, Journal of the American Chemical Society, 2009, vol. 131, p. 8394 - 8395
作者:Cui, Li、Peng, Yu、Zhang, Liming
DOI:——
日期:——
Polymer-bound 4-benzylsulfonyl-1-triphenylphosphoranylidene-2-butanone as a tool for the solid-phase synthesis of substituted piperidin-4-one derivatives.
作者:Achille Barco、Simonetta Benetti、Carmela De Risi、Paolo Marchetti、Gian P. Pollini、Vinicio Zanirato
DOI:10.1016/s0040-4039(98)01650-5
日期:1998.10
An efficient method for the construction of 2-substituted-piperidin-4-one derivatives on solid support has been developed using polymer-bound 4-benzylsulfonyl-I-triphenylphosphoranylidene-2-butanone as a convenient precursor for substituted divinyl ketones in the heterocyclization reaction with amines. The resin was released in a recyclable sulfinate form. (C) 1998 Elsevier Science Ltd. All rights reserved.
Combinatorial synthesis of dihydropyridone libraries and their derivatives
作者:Mark W. Creswell、Gary L. Bolton、John C. Hodges、Malte Meppen
DOI:10.1016/s0040-4020(98)00130-6
日期:1998.4
used for parallel purification of combinatoriallibraries of dihydropyridones and their derivatives. The dihydropyridone scaffold was assembled via a solution phase Lewis acid catalyzed, herero-Diels-Alder reaction. Further modifications allow for the rapid generation of subsequent aminopiperidine and acyl-aminopiperidine libraries utilizing a library from library approach.
Improved Heteroatom Nucleophilic Addition to Electron-Poor Alkenes Promoted by CeCl<sub>3</sub>·7H<sub>2</sub>O/NaI System Supported on Alumina in Solvent-Free Conditions
environmental consciousness in chemical research, the solvent-freeMichaeladdition has attracted our attention. In continuation of our ongoing program to develop synthetic protocols utilizing cerium trichloride, we report an extension of the CeCl3·7H2O/NaI combination supported undersolvent-freeconditions to promote heteroatom Michaeladdition. Using neutral alumina (Al2O3) as solid support permits us
杂原子亲核试剂与强吸电子基团共轭的碳-碳双键的共轭加成是合成有机化学中最重要的新成键策略之一。在这些迈克尔加成方法中,路易斯酸已显示出最佳的启动子活性,特别是,浸渍在无机载体上的试剂的使用正在迅速增加。随着化学研究中环境意识的增强,无溶剂迈克尔的加入引起了我们的关注。在我们正在进行的利用三氯化铈开发合成方案的计划的继续中,我们报告了CeCl 3 ·7H 2的扩展O / NaI组合在无溶剂条件下得到支持,以促进杂原子迈克尔的加成。使用中性氧化铝(Al 2 O 3)作为固体载体可以避免某些与无机载体为硅胶的过程相关的问题。CeCl 3 ·7H 2 O / NaI / Al 2 O 3该系统对于利用弱亲核试剂(例如咪唑和氨基甲酸酯)的杂配迈克尔加成反应很好,并且在不同于α,β-不饱和羰基化合物的迈克尔受体的情况下,反应也以良好的收率进行。该方法的重要合成应用是生产4-哌啶酮衍生物时的分子内氮杂-