A remarkable rearrangement during reaction between triazolopyridinium ylides and dimethyl acetylenedicarboxylate
摘要:
The ylides from 2-acylmethyltriazolopyridinium salts (1) react with dimethyl acetylenedicarboxylate in toluene solution to give the 7-pyrroleninylpyrazolo[1,5-a]pyridines (5).