Microwave-assisted cycloadditions of 2-alkynylbenzonitriles with sodium azide: selective synthesis of tetrazolo[5,1-a]pyridines and 4,5-disubstituted-2H-1,2,3-triazoles
摘要:
Under microwave irradiation (75 W), treatment of 2-alkynylbenzonitriles with 1.5 equiv of sodium azide in DMSO at 140 degrees C gave 4,5-disubstituted-2H-1,2,3-triazoles in 60-99% yields. Additionally, adding 8 equiv of ZnBr2 and using 8 equiv of sodium azide in DMF at 100 degrees C lead to the formation of tetrazolo[5,1-a]isoquinolines up to 87% yield. (C) 2009 Elsevier Ltd. All rights reserved.
One-pot synthesis of triazole-fused isoindoles from o-alkynylbenzaldehydes and trimethylsilyl azide
作者:Noriko Okamoto、Takuya Sueda、Hideki Minami、Reiko Yanada
DOI:10.1016/j.tetlet.2018.03.002
日期:2018.4
An efficient one-pot synthesis of 1,2,3-triazole-fused isoindoles from o-alkynylbenzaldehydes and trimethylsilyl azide (TMSN3) is reported. The reaction proceeds through the formation of a diazide intermediate and a subsequent intramolecular azide-alkyne cycloaddition, providing a novel access to a variety of 8-azido-8H-[1,2,3]triazolo[5,1-a]isoindoles in high yields.
据报道,由邻炔基苯甲醛和三甲基硅烷基叠氮化物(TMSN 3)有效地一锅法合成1,2,3-三唑稠合的异吲哚。该反应通过形成二叠氮化物中间体和随后的分子内叠氮化物-炔烃环加成反应而进行,从而提供了一种新颖的途径来获得各种8-azido-8 H- [1,2,3] triazolo [5,1- a ] isoindoles高产。