aryl-substituted nitroalkenes). The dominant product configurations are identical, showing the chiral ruthenium center to have little influence. The free GBI-R ligand exhibits only modest activity. Unlike most transition-metal-catalyzed reactions, there is no direct interaction of the substrate with the ruthenium; rather, evidence is presented for “second coordination sphere promoted catalysis” mediated by
NHR基团代替NH 2(R:a,CH 2 Ph; b,(S C)-CH(CH 3)Ph; c,(R C R C)-CH(CN)的2-Guanidinobenzimidazole(GBI)衍
生物CH 2)4 CHNMe 2;d,(R C R C)-CH(CH 2)4 CH- NCH 2(CH 2)3 CH 2由
2-氨基苯并咪唑按四个步骤制备)。与反应[(η 5 -C 5 H ^ 5)的Ru(CO)(NCCH 3)2 ] + PF 6 - (5 + PF 6 - ),得到手性的
金属螯合物[(η 5 -C 5 H ^ 5)Ru(CO)(GBI -R)] + PF 6 –(6a – d + PF 6 –,39–77%),已通过NMR(1 H,13 C,31 P,19 F)和其他光谱。的二甲基
氨基的
钌,C构型非对映体含有复合6C + PF 6 -时氧化铝色谱分离(ř孺ř Ç ř Ç,> 99:01博士;小号孺ř