Conversion of methyl ketones and methyl sulfones into α-deutero-α,α-difluoromethyl ketones and α-deutero-α,α-difluoromethyl sulfones in three synthetic steps
作者:Munia F. Sowaileh、Changho Han、Robert A. Hazlitt、Eun Hoo Kim、Jinu P. John、David A. Colby
DOI:10.1016/j.tetlet.2016.12.018
日期:2017.2
Deuterodifluoromethyl ketones and sulfones were assembled in three synthetic steps from methyl ketones and sulfones, respectively. The key synthetic transformation is the deuteration of the difluorocarbanion generated by the release of trifluoroacetate from highly α-fluorinated gem-diols. High levels of deuterium on the "CF2D" group were routinely observed. This strategy is mild and versatile and it
在三个合成步骤中,分别从甲基酮和砜中组装了氘代二氟甲基酮和砜。关键的合成转化是由高度α-氟化的宝石二醇释放出三氟乙酸盐而产生的二氟乙二酮的氘代。常规观察到“ CF2D”组的氘水平很高。该策略温和且用途广泛,可用于酮和砜,而无需担心过度氟化或氟化不足。另外的例子解决了当具有其他酸性质子的化合物经受反应条件时的氘化过度的问题。该过程不仅证明了安装“ CF2D”基团的新方法,而且将三氟乙酸盐释放的范围扩展到了砜。