Microwave-assisted ethylene–alkyne cross-metathesis: synthesis of chiral 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes
摘要:
Chiral 1-arylpropargyl amides, which are resistant to undergoing ethylene-alkyne cross-metathesis at atmospheric pressure, were reacted under microwave irradiation to afford enantiomerically enriched 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes within a few minutes. Enantiomerically enriched amides underwent ethylene-alkyne cross-metathesis with retention of configuration at the propargylic/allylic position. A series of chiral 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes were synthesised with ee >= 95%; these latter compounds could be used as building blocks for the synthesis of new antifungal and antiaromatase agents. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of enantiomerically pure α-[4-(1-substituted)-1,2,3-triazol-4-yl]-benzylacetamides via microwave-assisted click chemistry: towards new potential antimicrobial agents
Chiral 1-phenyl-2-propynylamines are important building blocks for the synthesis of antifungal and antiaromatase agents related to bifonazole. In this report, a microwave-assisted Cu(I)-catalyzed ‘click chemistry’ approach has been employed to easily generate a small library of enantiomerically pure α-[4-(1-substituted)-1,2,3-triazol-4-yl]benzylacetamides starting from racemic propargylamines. These
Resolution of (±)-1-Aryl-2-propynylamines via Acyltransfer Catalyzed by <i>Candida antarctica</i> Lipase
作者:Flavia Messina、Maurizio Botta、Federico Corelli、Manfred P. Schneider、Fabio Fazio
DOI:10.1021/jo982513i
日期:1999.5.1
Metal-Free Cascade Approach toward Polysubstituted Indolizines from Chromone-Based Michael Acceptors
作者:Thomas Lepitre、Raphael Le Biannic、Mohamed Othman、Ata Martin Lawson、Adam Daïch
DOI:10.1021/acs.orglett.7b00309
日期:2017.4.21
An efficient cascade transformation toward indolizine-based molecules has been developed. This process leads to the rapid construction of two C-N bonds and one C-C bond without the need of any metal catalysis. The approach involves easily accessible chromone-based Michael acceptors and propargylamine derivatives as starting materials. This cascade constitutes a novel and very competitive alternative to the well reported strategies using pyridine or pyrrole derivatives for accessing the indolizine ring with substituents at uncommon C-positions
Microwave-assisted ethylene–alkyne cross-metathesis: synthesis of chiral 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes
作者:Daniele Castagnolo、Michela L. Renzulli、Elena Galletti、Federico Corelli、Maurizio Botta
DOI:10.1016/j.tetasy.2005.08.002
日期:2005.9
Chiral 1-arylpropargyl amides, which are resistant to undergoing ethylene-alkyne cross-metathesis at atmospheric pressure, were reacted under microwave irradiation to afford enantiomerically enriched 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes within a few minutes. Enantiomerically enriched amides underwent ethylene-alkyne cross-metathesis with retention of configuration at the propargylic/allylic position. A series of chiral 2-(N-1-acetyl-1-arylmethyl)-1,3-butadienes were synthesised with ee >= 95%; these latter compounds could be used as building blocks for the synthesis of new antifungal and antiaromatase agents. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of pyrazino[1,2-<i>b</i>]indazoles <i>via</i> cascade cyclization of indazole aldehydes with propargylic amines
An efficient intermolecular annulation of indazole aldehydes with propargylic amines has been developed for the synthesis of pyrazinoindazoles under catalyst- and additive-free conditions. This straightforward methodology was found to feature a wide substrate scope, high atom economy and environmental advantages. The bioactivity results of these new pyrazino[1,2-b]indazoles showed that some of them
已经开发出吲唑醛与炔丙胺的有效分子间成环反应,用于在无催化剂和添加剂的条件下合成吡嗪并吲唑。人们发现这种简单的方法具有底物范围广、原子经济性高和环境优势的特点。这些新型吡嗪并[1,2- b ]吲唑类化合物的生物活性结果表明,其中一些化合物表现出显着的抗真菌活性。