Heterocycles in organic synthesis. Part 19. Thermolysis of pyridinium N-acylimines: a new preparation of isocyanates

AR Katritzky, J Lewis, PL Nie

文献索引：Katritzky,A.R.; Thind,S.S. Journal of the Chemical Society, Chemical Communications, 1979 , p. 138

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被引用次数: 3

摘要

2, 4, 6-Triphenylpyrylium perchlorate converts hydrazides into the 1-amidopyridinium perchlorates (25) which are easily deprotonated to the free pyridinium 1-acylimines (8). These are alternatively prepared by acylation of the 1-amino-2, 4, 6-triphenylpyridinium cation. The 1-acylimines undergo smooth thermolysis to 2, 4, 6-triphenylpyridine and the corresponding isocyanates, constituting a practical synthetic method for the latter. 1- ...