Regioselective Synthesis of Indene from 3-Aryl Propargylic<i>gem</i>-Dipivalates Catalyzed by<i>N</i>-Heterocyclic Carbene Gold(I) Complexes
作者:Damien Hueber、Matthieu Teci、Eric Brenner、Dominique Matt、Jean-Marc Weibel、Patrick Pale、Aurélien Blanc
DOI:10.1002/adsc.201800305
日期:2018.7.4
1‐Aryl‐3,3‐bis(pivaloyloxy)propynes can be converted in good to high yields into either 1,3‐ or 1,2‐bis(pivaloyloxy)indenes, depending on the N‐heterocyclic carbene (NHC) gold(I) hexafluoroantimonate catalyst used. Almost exclusive formation of 1,3‐di(oxycarbonyl)indene derivatives was achieved with cationic gold complexes containing the embracing N,N′‐1,3‐bis(9‐butylfluorenyl)benzimidazolylidene ligand
可以将N-杂环卡宾(NHC)金(1-芳基3,3-双(新戊酰氧基)丙炔以高收率高收率转化为1,3-或1,2-双(新戊酰氧基)茚基( I)使用的六氟锑酸盐催化剂。1,3-二(氧羰基)茚衍生物的几乎只形成与含阳离子拥抱金配合实现Ñ,N' -1,3-双(9-芴基)配体benzimidazolylidene(Ñ卜FNHC)。反应的区域选择性问题通过n Bu中特定空间的特定空间分布来合理化FNHC配体。与此相反,用更经典NHC金配合观察到有利于1,2-二取代的茚仅适度选择性,而然后用所获得的最好的选择性Ñ,Ñ '-1,3-二(2,6-二异丙基)-4- ,5-二氢咪唑基氯化金(SIPrAuCl)作为前催化剂。