A new route to the pyridine nucleus fused to some heterocycles
S Hibino, S Kano, N Mochizuki…
Index: Hibino, Satoshi; Kano, Shinzo; Mochizuki, Naoki; Sugino, Eiichi Journal of Organic Chemistry, 1984 , vol. 49, # 25 p. 5006 - 5008
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Citation Number: 35
Abstract
In seeking a more direct route to fused pyridine ring systems, we have found that l-aza-1, 3, 5-hexatrienes based on the five-membered ring of thiophene or indole undergo a facile intramolecular thermal cyclization with loss of water to yield fused pyridine rings. 5 We here report on the use of this cyclization to prepare some thieno [3, 2-c]-pyridines and some 5H- pyrido [4, 3-b] indoles.(*;-(p+
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