An efficient desymmetrizing carbonyl–enereaction of 1-substituted 4-methylenecyclohexanes with glyoxal derivatives was thus executed by a chiral N,N′-dioxide/NiII catalyst, providing facile access to cyclohexene derivatives bearing two remote 1,6-related stereocenters. This distal stereocontrol methodology originates from the efficient interaction between the catalyst with enophiles, discrimination
因此,通过手性N,N'-二氧化物/ Ni II催化剂可以有效地使1-取代的4-亚甲基环己烷与乙二醛衍生物的羰基-烯键解对称,从而可以轻松地获得带有两个遥远的1,6-相关立体中心的环己烯衍生物。这种远端的立体控制方法源于催化剂与亲溶剂之间的有效相互作用,对烯烃组分的两个椅子构象的区分以及烯键过程的固有六元过渡态结构。
WELCH, S. C.;RAO, A. S. C. PRAKASA;LYON, J. T.;ASSERCQ, J. -M., J. AMER. CHEM. SOC., 1983, 105, N 2, 252-257
作者:WELCH, S. C.、RAO, A. S. C. PRAKASA、LYON, J. T.、ASSERCQ, J. -M.