Selective Cyclopalladation of R<sub>3</sub>PNCH<sub>2</sub>Aryl Iminophosphoranes. Experimental and Computational Study
作者:Raquel Bielsa、Rafael Navarro、Esteban P. Urriolabeitia、Agustí Lledós
DOI:10.1021/ic701144y
日期:2007.11.1
C6H(4)-2-Br (1b), C6H4-Me-2 (1e), C6H3-(Me)(2)-2,5 (1f); R=p-tolyl, Aryl=Ph (1c); R=m-tolyl, Aryl=Ph (1d); R3P=MePh2P, and Aryl=Ph (1g)) has been studied. 1a reacts with Pd(OAc)2 (OAc=acetate) giving endo-[Pd(micro-Cl)C,N-C6H4(PPh2=NCH2Ph)-2}]2 (3a), while exo-[Pd(micro-Br)C,N-C6H4(CH2N=PPh3)-2}]2 (3b) could only be obtained by the oxidative addition of 1b to Pd2(dba)3. The endo form of the metalated ligand
亚氨基正膦R3P = NCH2Aryl(R = Ph,Aryl = Ph(1a),C6H(4)-2-Br(1b),C6H4-Me-2(1e),C6H3-(Me)(2) )-2,5(1f); R =对甲苯基,芳基= Ph(1c); R =间甲苯基,芳基= Ph(1d); R3P = MePh2P,和Aryl = Ph(1g)) 。1a与Pd(OAc)2(OAc =乙酸酯)反应生成内-[Pd(micro-Cl)C,N-C6H4(PPh2 = NCH2Ph)-2}] 2(3a),而exo- [Pd(micro -Br)C,N-C6H4(CH2N = PPh3)-2}] 2(3b)只能通过将1b氧化添加到Pd2(dba)3中来获得。金属化配体的内在形式在动力学和热力学上都是有利的,如exo- [Pd(micro-OAc)C,N-C6H4(CH2N = PPh3)-2}] 2(2b)转化为内-