Regioselective ortho palladation of stabilized iminophosphoranes in exo positions:: Scope, limitations, and mechanistic insights

被引:38
作者
Aguilar, David [2 ]
Bielsa, Raquel [2 ]
Contel, Maria [3 ,4 ]
Lledos, Agusti [1 ]
Navarro, Rafael [2 ]
Soler, Tatiana [5 ]
Urriolabeitia, Esteban P. [2 ]
机构
[1] Univ Autonoma Barcelona, Dept Quim, E-08193 Barcelona, Spain
[2] Univ Zaragoza, CSIC, ICMA, Dept Compuestos Organomet, E-50009 Zaragoza, Spain
[3] CUNY Brooklyn Coll, Brooklyn, NY 11210 USA
[4] CUNY, Grad Ctr, Brooklyn, NY 11210 USA
[5] Univ Alicante, Fac Ciencias Fase 2, Serv Tecn Invest, Alicante 03690, Spain
关键词
D O I
10.1021/om701174v
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The reactivity of the stabilized iminophosphoranes R3P = NC(O)Ph (R = p-tolyl, m-tolyl), Ph3P = NC(O)CH2Ph, and Ph2P(CH2)(n)PPh2 = NC(O)Ph (n = 1, 2) toward Pd(OAc)(2) has been examined. These substrates undergo palladation at the ortho C(sp(2))-H bond of the benzamide ring, giving exo complexes with complete regioselectivity. The mechanism of this reaction has been studied using DFT calculations and the regioselectivity explained on a kinetic basis, since the activation barrier is lower for the exo pathway than for the endo. The origin of this lower energy for the exo barrier seems to reside mainly on the interaction energy between the metal center and the ligand at the transition state. On the other hand, the palladation of the related keto-stabilized systems Ph3P = NC(O)FG (FG = NC4H8, NC4H8O) gives selectively the endo isomers through C-H bond activation at the Ph ring of the PPh3 unit.
引用
收藏
页码:2929 / 2936
页数:8
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