Highly efficient synthesis of α,β-acetylenic aldehydes from terminal alkynes using DMF as the formylating reagent
作者:Michel Journet、Dongwei Cai、Lisa M. DiMichele、Robert D. Larsen
DOI:10.1016/s0040-4039(98)01352-5
日期:1998.9
The formylation of lithium acetylides with DMF led to α,β-acetylenic aldehydes in excellent yields (>94%). A reverse quench into a phosphate buffer (10% aqueous KH2PO4,4 equiv) proved to be the key for this high-yielding reaction.
乙炔锂与DMF的甲酰化反应可产生高产率(> 94%)的α,β-炔醛。反向骤冷到磷酸盐缓冲液(10%含水KH 2 PO 4证明,4当量),以对于此高产反应的关键。
We have developed a novel ring-opening difluorination process for pyrazoloazines. Utilizing 2.5 equivalents of Selectfluor®, this method enables electrophilic difluorination and subsequent ring-opening of pyrazoloazines, yielding the corresponding difluoroalkylated azines. Additionally, our protocol extends to the decarbonylative difluorination of pyrazoloazines when starting with a formyl group at