Abstract
A synthetic approach to the previously unknown thieno[2,3-f ][1,2,4]triazolo[1,5-a ]azepine derivatives was efficiently
accomplished by cycloaddition of the bicyclic 1-aza-2-azoniaallene
salts 6 , derived from 6,7-dihydrobenzo[b ]thiophen-4(5H )-one hydrazones 4 , to the triple bond of nitriles, followed
by ring enlargement. The X-ray crystal diffraction analysis of the
picrate 10a provided affirmative proof
for the structural assignment made.
Key words
1-aza-2-azoniaallene cations - cycloaddition - nitriles - ring enlargement - thieno[2,3-f ][1,2,4]triazolo[1,5-a ]azepines
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