Copper-Catalyzed C–H Difluoroalkylations and Perfluoroalkylations of Alkenes and (Hetero)arenes
作者:Xiaoyang Wang、Shuang Zhao、Jing Liu、Dingsheng Zhu、Minjie Guo、Xiangyang Tang、Guangwei Wang
DOI:10.1021/acs.orglett.7b01712
日期:2017.8.18
A general and facile syntheticmethod for C(sp2)–H difluoroalkylations and perfluoroalkylations of alkenes and (hetero)arenes with commercially available fluoroalkyl halides has been developed with a copper-amine catalyst system. This method is characterized by high yields, mild reaction conditions, low-cost catalyst, broad substrate scope, and excellent functional group compatibility, therefore providing
Enhancement of Neighbouring-Group Participation in Cu<sup>0</sup>-Promoted Cross-Coupling<i>gem</i>-Difluoromethylenation of Aryl/Alkenyl Halides with 1,3-Azolic Difluoromethyl Bromides
3‐azolic (oxa‐, thia‐ or aza‐) difluoromethyl bromides or 2‐bromodifluoromethyl‐1,3‐oxazoline has been developed for the construction of pharmaceutically important gem‐difluoromethylene‐linked twin molecules. The unique π‐conjugated aryl‐fused 1,3‐azolic moiety in difluoromethyl bromide substrates could stabilise the reaction intermediates, which promotes the reactivities, providing facile access to the
A simple and highly efficient Cu-mediated gem-difluoromethylenation of a variety of aryl boronic acids with bromodifluoromethylated heterocyclic compounds has been disclosed. The transformations were performed in air at room temperature without ligands, bases, or additives.
An unprecedented iron/palladium-catalyzed reductive cross-coupling of alkenylbromides and bromodifluoromethanes with manganese as the reductant has been disclosed. A variety of functional groups was well tolerated, providing various substituted gem-difluoroallylenes in moderate to good yields. The preliminary mechanism studies ruled out the radical pathway for this new reaction.