作者:Oleg V. Fedorov、Mikhail D. Kosobokov、Vitalij V. Levin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.joc.5b00904
日期:2015.6.5
involves silylation, difluorocarbene addition using Me3SiCF2Br activated by a bromide ion, and halogenation of intermediate cyclopropanes with N-bromo- or N-iodosuccinimide. The whole process is performed without isolation of intermediates. The resulting α,α-difluoro-β-halo-substituted ketones can be readily converted into fluorine containing pyrazole derivatives and oxetanes.
描述了一种方法,对酮进行二氟同构并伴有CH键的卤化。该反应包括甲硅烷基化,使用被溴离子激活的Me 3 SiCF 2 Br加成二氟卡宾,以及用N-溴或N-碘代琥珀酰亚胺卤化中间环丙烷。整个过程无需分离中间体。所得的α,α-二氟-β-卤代酮可容易地转化为含氟的吡唑衍生物和氧杂环丁烷。