Controlled Acrylate Insertion Regioselectivity in Diazaphospholidine-Sulfonato Palladium(II) Complexes
作者:Philipp Wucher、Philipp Roesle、Laura Falivene、Luigi Cavallo、Lucia Caporaso、Inigo Göttker-Schnetmann、Stefan Mecking
DOI:10.1021/om300755j
日期:2012.12.24
entirely inverted from >93% 1,2-insertion for bulky substituents (1d–f, yielding the insertion products [(P∧O)Pdκ2-C,O-CH2CHMeC(O)OMe], 12) to the usual electronically controlled 2,1-insertion (>95%) for the less bulky Ar = Ph (1a, yielding the insertion product [(P∧O)Pdκ2-C,O-CHEtC(O)OMe], 11, and β-H elimination product methyl crotonate). DFT studies underline that this is due to a more favorable insertion
Diazaphospholidine磺酸基的Pd(II)配合物[κ 2 - P,O-(Ñ -Ar 2 c ^ 2 ^ h 4 Ñ 2 P)C ^ 6 ħ 4 SO 3 } PDME(L)] 1- L(L = DMSO,吡啶,二甲基吡啶,或μ的LiCl(溶剂); 1A:Ar为PH,1B:Ar为2-MEC 6 ħ 4,1C:Ar为2- MeOC 6 ħ 4,1D:Ar为2,4,6-我3 c ^ 6 ħ 2,1E:Ar为2,6-我PR 2 ç 6 ħ 3,1F:Ar为2,6-(p -甲苯基)2 C ^ 6 ħ 3)中制备和结构表征。丙烯酸甲酯(MA)插入的Pd-ME键的区域选择性完全倒置从> 93%1,2-插入为大的取代基(1D - ˚F,得到插入产品[(P ∧ O)的Pd κ 2 - C,O - C H 2 CHMeC(O)OMe],12)到通常的电子控制2,1插入(> 95%),而体积较小的Ar