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.
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。
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