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).
Triazolopyridines. Part 11. Ylides derived from 2-Acylmethyltriazolopyridinium salts.
作者:Belen Abarca、Rafael Ballesteros、Fatemeh Mojarrad、Mohamed R. Metni、Santiago Garcia-Granda、Enrique Perez-Carreño、Gumos Jones
DOI:10.1016/s0040-4020(01)87139-8
日期:1991.1
Ylides derived from 2-acylmethyltriazolopyridinium salts (2a) -(2c) react with methyl or ethyl propiolate and with dimèthyl acetylenedicarboxylate to give ylides (3a)–(3e), (6) or (7). In some cases 1:2 adducts are formed, shown to be the novel ylides (8a)–(8d); an X-ray diffraction confirms structure (8a).