Insertion of carbenoids into X-H bonds catalyzed by the cyclobutadiene rhodium complexes
作者:Natalia L. Loskutova、Nikita V. Shvydkiy、Yulia V. Nelyubina、Dmitry S. Perekalin
DOI:10.1016/j.jorganchem.2017.08.010
日期:2018.7
The cyclobutadiene rhodium complex [(C4Et4)RhCl]2 (generated from [(C4Et4)Rh(p-xylene)]PF6 and BnNEt3Cl) catalyzes the reaction of methyl α-diazophenylacetate with RnX-H compounds to give the insertion products methyl 2-RnX-2-phenylacetates in 70–90% yields (RnX-H = methanol, tert-butylamine, 2,6-diisopropylaniline, morpholine, diallylamine, triethylsilane, triethylamine-borane). The stoichiometric
环丁二烯铑配合物[(C 4 Et 4)RhCl] 2(由[(C 4 Et 4)Rh(对二甲苯)] PF 6和BnNEt 3 Cl生成)催化α-重氮苯基乙酸甲酯与R n XH的反应化合物以70-90%的产率获得插入产物2-R n X-2-苯基乙酸甲酯(R n X-H =甲醇,叔丁胺,2,6-二异丙基苯胺,吗啉,二烯丙基胺,三乙基硅烷,三乙胺-硼烷)。[(C 4 Et 4)RhI] 2的化学计量反应与α-重氮苯基乙酸甲酯反应,得到中间体配合物(C 4 Et 4)2 Rh 2(μ-I)2(μ-1-羧甲基-1-苯基亚甲基),其具有桥联碘化物和卡宾配体的双核结构。该结果表明,与通常假定的L n M = CR 2相比,具有催化活性的卡宾物质可能具有更复杂的结构。