A straightforward and general method has been developed for the synthesis of phthalimide derivatives from 2-iodobenzamides and PPh3/I2/HCOOH in the presence of a catalytic amount of Pd(OAc)2. The reaction results demonstrate that PPh3/I2/HCOOH is a facile, efficient and safe CO source. The whole process is carried out in toluene at 80 °C and furnishes the desired products in good to excellent yields
已经开发了一种简单且通用的方法,用于在催化量的Pd(OAc)2存在下由2-碘联苯甲酰胺和PPh 3 / I 2 / HCOOH合成邻苯二甲酰亚胺衍生物。反应结果表明,PPh 3 / I 2 / HCOOH是一种简便,高效,安全的CO源。整个过程在80°C的甲苯中进行,并以优异的产率提供了所需的产品。
Copper(I) Iodide Catalyzed Domino Process to Quinazolin-4(3<i>H</i>)-ones
An efficient synthesis of substituted quinazolin-4(3H)-ones by a one-pot ligand-free CuI-catalyzed coupling/condensative cyclization under mild conditions is described. Our study provides an alternative strategy for the preparation of biologically active quinazolin-4(3H)-ones.
Palladium-Catalyzed Regioselective 5-<i>exo</i>-<i>O</i>-Cyclization/Oxidative Heck Cascades from<i>o</i>-Alkynylbenzamides and Electron-Deficient Alkenes
作者:Youssef Madich、Rosana Álvarez、José M. Aurrecoechea
DOI:10.1002/ejoc.201402709
日期:2014.10
Pd-catalyzed 5-exo-selective oxycyclization/oxidative Heck coupling cascade is described, starting from readily available ortho-alkynylbenzamides and functionalized olefins. The key to a high regioselectivity in the cyclization step is the choice of catalyst and/or additives. Thus, Pd(OAc)2 provides the desired 5-exo products predominantly, whereas with PdCl2 or Pd(TFA)2, the corresponding 6-endo products
Electrochemical oxidative 5-exo-dig-oxo-halocyclization of o-alkynylbenzamides was achieved using readily available NaX (X = Cl, Br and I) salts under mild reactionconditions. The use of a cheap and highly stable sodiumhalide as a halide ion source is impressive for the synthesis of a variety of halogenated isobenzofuran-1-imines. This electrochemical protocol shows regioselectivity and excellent