Microwave-assisted regioselective N-alkylation of cyclic amidines
摘要:
A simple and efficient methodology for regioselective alkylation of exocyclic nitrogen of cyclic amidines was developed by microwave-assisted heating in the presence of amines. Novel N-alkylated 3,4-dihydropyrazino [2, 1-b]quinazolin-6-ones were prepared in good yields. The reaction occurred via a transamination (addition-elimination) process involving a first attack of the amine on the electrophilic carbon of the amidine function. (C) 2007 Elsevier Ltd. All rights reserved.
Synthesis of novel 2,3-substituted quinazolin-4-ones by condensation of alkyl or aromatic diamines with 5-(N-arylimino)-4-chloro-5H-1,2,3-dithiazoles
作者:Maria de Fatima Pereira、Valérie Thiéry、Thierry Besson
DOI:10.1016/j.tet.2006.11.028
日期:2007.1
N-(4-chloro-5H-1,2,3-dithiazol-5-ylidene)-anthranilates to afford quinazolines, which are very interesting starting materials for the access to novel 2,3-condensed quinazolin-4-ones. On the other side, aromatic amines allow the synthesis of polycyclic molecules, which are structurally close to the model natural products (e.g., rutaecarpine, luotonine, tryptanthrine and vasicinone).
本文描述的工作是Appel盐在新型杂环概念中的效用的另一个示例。我们证实,伯烷基二胺可能容易与N-(4-氯-5 H -1,2,3-二噻唑-5-亚甲基)-邻氨基苯甲酸甲酯反应生成喹唑啉,这是获得新颖化合物的非常有趣的起始原料2,3-缩合的喹唑啉-4-酮。另一方面,芳族胺允许合成多环分子,该多环分子在结构上接近模型天然产物(例如,芸香芸香碱,色氨酸,色氨酸和血管紧张素)。
Efficient synthesis of novel pentacyclic 6,7-dihydro-5a,7a,13,14-tetraaza-pentaphene-5,8-diones
作者:Maria de Fatima Pereira、Laurent Picot、Jean Guillon、Jean-Michel Léger、Christian Jarry、Valérie Thiéry、Thierry Besson
DOI:10.1016/j.tetlet.2005.03.133
日期:2005.5
The convenientsynthesis of novel tetraaza-pentaphene-5,8-diones (3) is described, in two steps, from anthranilicacidderivatives, via a microwave-assisted Niementowski reaction. A short evaluation of the antiproliferative activity of these new pentacyclic heterocycles was realised.