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.
copper-catalyzed method for the synthesis of tetrazolo[5,1-a]isoquinolines has been developed starting from alkenyl-1,2-bis(boronates). The domino reaction underwent a Suzuki-Miyaura cross-coupling reaction and an azidation followed by an in situ [3 + 2] cycloaddition. Regioselective synthesis has been demonstrated by inverting the Suzuki-Miyaura cross-coupling reaction and the azidation.
开发了一种以烯基-1,2-双(硼酸酯)为原料合成四唑并[5,1- a ]异喹啉的有效铜催化方法。多米诺骨牌反应经历了铃木-宫浦交叉偶联反应和叠氮化反应,然后进行原位[3 + 2]环加成反应。区域选择性合成已通过反转 Suzuki-Miyaura 交叉偶联反应和叠氮化反应得到证实。