Base-Promoted Annulative Difluoromethylenation of Enaminones with BrCF<sub>2</sub>CO<sub>2</sub>Et toward 2,2-Difluorinated 2,3-Dihydrofurans
作者:Jinbiao Ying、Ting Liu、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.orglett.2c00671
日期:2022.4.1
A practical method for the synthesis of 2,2-difluorinated 2,3-dihydrofurans has been established via the [4 + 1] annulation of enaminones and BrCF2CO2Et with Na2CO3 promotion. This new protocol does not employ any transition metal reagent and enables the annulative difluoromethylation by the partial cleavage of the C═C double bond. In addition, the further treatment with hydrochloric acid in one pot
通过烯胺酮和BrCF 2 CO 2 Et 与Na 2 CO 3促进的[4 + 1] 环化,建立了一种合成2,2-二氟代2,3-二氢呋喃的实用方法。该新方案不使用任何过渡金属试剂,并通过 C=C 双键的部分裂解实现环状二氟甲基化。此外,在一锅中用盐酸进一步处理会通过形式烯胺酮 C-N 羧化生成 β-酮烯酸(4-氧代-2-丁烯酸)。