step proceeds with a cooperative catalytic activity of Pd and Cu. On the other hand, N-(alkoxycarbonyl)indoles are produced via the reaction of 2-(alkynyl)phenylisocyanates and alcohols under a catalytic amount of Na(2)PdCl(4) (5 mol %) or PtCl(2) (5 mol %). Pd(II) or Pt(II) catalyst exhibits dual roles; it acts as a Lewis acid to accelerate the addition of alcohols to isocyanates and as a typical transition-metal
在Pd(PPh(3))(4)(1 mol%)和CuCl(4 mol%)存在下,2-(炔基)苯基
异氰酸酯与
碳酸烯
丙酯反应合成3-烯丙基-N-(烷氧基羰基)
吲哚)双
金属催化剂。Pd(0)最有可能充当形成环烷基烯丙基
钯醇盐中间体的催化剂,Cu(I)充当
路易斯酸以活化
异氰酸酯,并且环化步骤以Pd的协同催化活性进行和
铜。另一方面,在催化量的Na(2)PdCl(4)(5 mol%)或PtCl(2)(5)下,2-(炔基)苯基
异氰酸酯与醇反应生成N-(烷氧基羰基)
吲哚。摩尔%)。Pd(II)或Pt(II)催化剂表现出双重作用。