Novel [Ruthenium(substituted‐tetramethylcyclopentadiene) (2‐quinolinecarboxylato)(allyl)] Hexafluorophosphate Complexes as Efficient Catalysts for Highly Regioselective Nucleophilic Substitution of Aliphatic Allylic Substrates
作者:Hui‐Jun Zhang、Bernard Demerseman、Loïc Toupet、Zhenfeng Xi、Christian Bruneau
DOI:10.1002/adsc.200800135
日期:2008.7.7
arrangement. Complexes 3a (R=R′=Me) and 3b are involved as precatalysts favoring the formation of branched products in regioselective nucleophilic allylic substitution reactions, starting from ethyl 2-(E)-hexen-1-yl carbonate and chlorohexene as unsymmetrical aliphatic allylic substrates. Phenols, dimethyl malonate, and primary (aniline) and secondary (pyrrolidine, piperidine) amines have been used
稳定的六氟磷酸盐[钌(R-取代-四甲基环戊二烯)(2-喹啉羧基)(1-R'-取代烯丙基)(R = Me,R'= H,Me,n- Pr,Ph; R = t- Bu, R'= Me)的和[钌(五甲基环戊二烯)(2- quinolinecarboxylato)(1- ñ -propylallyl)]四氟硼酸盐(4'A),作为allylruthenium(IV)配合物,已在一个步骤中合成,由[钌起始( R-取代的四甲基环戊二烯)三(乙腈)六氟磷酸盐或四氟硼酸盐络合物,喹二酸和烯丙醇。获得了单一的立体异构体,并确定了3b(R = t- Bu,R'= Me)和4'a的X射线单晶结构允许指定一种首选的安排。配合物3a(R = R'= Me)和3b作为预催化剂参与区域选择性亲核烯丙基烯丙基取代反应中支化产物的形成,起始于乙基2- (E) -己烯-1-基碳酸酯和氯己烯作为不对称脂族烯丙基基材。在温和的碱性条