Pyrazolopyridines. 1. Formylation and Acylation of Pyrazolo[1,5-a]pyridines
作者:Ken-ichi Tanji、Takehiko Sasahara、Junko Suzuki、Takeo Higashino
DOI:10.3987/com-92-s(t)85
日期:——
In the treatment of pyrazolo[1,5-a]pyridines with dimethylformamide and,phosphorus oxychloride, Vilsmeier-Haack formylation proceeded at the 3-position, giving 3-pyrazolo[1,5-a]pyridinecarboxaldehydes. Reaction of the pyrazolo[1,5-a]pyridine with acyl halide gave 3-acylpyrazolo[1,5-a]pyridines. Conversion of the formyl group into the alkenyl group was achieved easily by Wittig reaction.