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
作者:Haizhen Jiang、Wenjun Lu、Kun Yang、Guobin Ma、Minjun Xu、Jian Li、Jianhua Yao、Wen Wan、Hongmei Deng、Shaoxiong Wu、Shizheng Zhu、Jian Hao
DOI:10.1002/chem.201402205
日期:2014.8.4
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
铜(0)促进了未活化的芳基或烯基卤化物与苯并1,3-氮杂(氧杂,硫杂或氮杂)二氟甲基溴化物或2-溴二氟甲基-1,3-恶唑啉的铜(0)促进的直接还原宝石-二氟甲基化反应。为构建药学上重要的宝石-二氟亚甲基连接的双分子而开发。二氟甲基溴基质中独特的π-共轭芳基稠合的1,3-唑基部分可以稳定反应中间体,从而提高反应活性,提供易于获得的交联产物,产率高至优异,并具有显着的官能团耐受性。该反应表现出增强的邻群参与作用。该方法可以为宝石的构建提供新的策略。通过进一步官能化1,3-唑基骨架,使二氟亚甲基连接相同或不相同的孪生药物。