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(NHC)Cu(CHF2)络合物催化碘代芳烃的二氟甲基化反应
Sanford等人报道了一种使用(NHC)Cu(CHF2)络合物(3)进行的二氟甲基化反应,该络合物可以通过氯[1,3-双(2,6-二异丙苯基)咪唑-2-亚基]铜(I)(1)和(二氟甲基)三甲基硅烷(2)形成的铜(I) / N-杂环卡宾(NHC)络合物进行制备分离。根据他们的报道,事先分离出的Cu(I)络合物3与多种官能团取代的碘代芳烃等当量地进行了反应,并高产率的得到了相应的二氟甲基化合物。另外,如果加入氟化铯,该反应则可以利用催化量的Cu(I)络合物1和2当量的2作为二氟甲烷的来源。一般情况下,二氟甲基铜(I)络合物物种(“Cu(I)-CHF2”)不稳定,并且很难分离。而该报道表明,通过与NHC配体形成(NHC)Cu(CHF2),Cu(I)物种可以被分离出。
文献
- Synthesis, Reactivity, and Catalytic Applications of Isolable (NHC)Cu(CHF2) Complexes