A convenient synthesis of novel series of 4-cyclohexyl-2-substituted [1,2,4]triazolo[1,5-a]quinazolin-5(4H)-ones. novel isomers of H1 antihistaminic activity agents.

[摘要]：A novel series of 2,4-disubstituted-1,2,4-triazolo[1,5-a]-quinazolin-5(4H)-ones, e. g. I, were prepd. by Dimroth rearrangement of their resp. isomers namely 1,4-disubstituted[1,2,4]triazolo[4,3-a]-quinazolin-5(4H)-ones. The latter were prepd. via new synthetic strategy based on 1,5-elecrocyclization of the resp. N-(4-oxo-3-cyclohexylquinazolin-2-yl)nitrilimines.

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