Guanidine and amidine mediated synthesis of bridgehead triazaphenalenes, pyrimidines and pyridines through domino reactions
作者:Ramendra Pratap、Abhijeet Deb Roy、Shom Prakash Kushwaha、Atul Goel、Raja Roy、Vishnu Ji Ram
DOI:10.1016/j.tetlet.2007.06.073
日期:2007.8
An efficient and concise synthesis of 8-amino-2,5-diaryl-1,9,9b-triazaphenalene-4-carboiiitriles has been delineated through two successive base catalyzed heteroaromatic annulations of 6-aryl-4-(piperidin-1-yl)-2H-pyran-2-one-3-cai-bonitriles by Quanidine hydrochloride in moderate yield. This reaction was further explored through the ring transformation of 4 with amidines and 11 to afford (2 6-dia ryl pyri mid i n-4-yl)acetonitriles and 6-aryl-4-(piperidine-1-yl)nicotinonitriles in excellent yields. (c) 2007 Elsevier Ltd. All rights reserved.