Rational Design and Evaluation of Upgraded Grubbs/Hoveyda Olefin Metathesis Catalysts: Polyfunctional Benzylidene Ethers on the Test Bench
作者:Michał Bieniek、Cezary Samojłowicz、Volodymyr Sashuk、Robert Bujok、Paweł Śledź、Noël Lugan、Guy Lavigne、Dieter Arlt、Karol Grela
DOI:10.1021/om200463u
日期:2011.8.8
the aromatic ring, were synthesized: (H2IMes)(Cl)2Ru═C(H)[(C6H3X)OR] (NE2 (69% yield), R = CH(Me)(C(O)OMe), X = NO2; KE2 (57% yield), R = CH(Me)(C(O)OMe), X = C(O)Me; KK2 (56% yield), R = CH2C(O)Me, X = C(O)Me). All these complexes were used as catalyst precursors in standard metathesis reactions and compared with commercial catalysts such as Grubbs II (G2), Grubbs/Hoveyda II (H2), and Nitro catalyst
该系列升级格鲁布斯/加入Hoveyda第二代催化剂(H的2 IMES)(CL)2 Ru═C(H)(C 6 H ^ 4 OR)(E2(71%产率),R = CH(Me)的(C( O)OMe); M2(58%产率),R = CH(C(O)OMe)2 ; Kme2(88%产率),R = CH 2 C(O)Me; Ket2(63%产率),R = CH 2 C(O)Et); 通过Grubbs第二代催化剂(H 2 IMes)(Cl)2 Ru(CHPh)(PCy 3)(G2)与Grubbs第二代催化剂的反应制备C2(58%收率),R = C(Me)CN。邻位取代的醚H(Me)C═CHC在CuCl作为膦清除剂的情况下,在6 H 4 OR中存在。这些配合物的X射线结构表明,作为亚苄基醚的末端取代基安装的酯,酮或丙二酸酯基的末端氧与金属配位,形成八面体结构。相反,复合物C2的腈基保持不配位。合成了甚至更复杂的