Tandem catalysis in ionic liquids: a recyclable catalytic synthesis of benzofuran derivatives
作者:Bartolo Gabriele、Raffaella Mancuso、Elvira Lupinacci、Giuseppe Salerno、Lucia Veltri
DOI:10.1016/j.tet.2010.05.109
日期:2010.8
A convenient, recyclable catalytic synthesis of benzofuran-2-acetic esters 2 by sequential Pd(0)-catalyzed deallylation—Pd(II)-catalyzed carbonylative heterocyclization of 1-(2-allyloxyphenyl)-2-yn-1-ols 1 in ionic liquids is presented. Reactions were typically carried out in BmimBF4 as the solvent at 100 °C and under 30 atm of CO, in the presence of catalytic amounts (1 mol %) of PdI2 in conjunction
一种方便的,可回收催化苯并呋喃-2-乙酸酯的合成2通过顺序的Pd(0) -催化脱烯丙基化-钯(II)催化的1-(2-烯丙氧基苯基)-2-炔-1-醇carbonylative heterocyclization 1中介绍了离子液体。反应通常在BmimBF进行4在100℃下,并在CO的30个大气压作为溶剂,在器Pd1的催化量(1摩尔%)的存在下2结合KI(1当量),PPH 3(4摩尔%),MeOH(28当量)和H 2 O(2当量)。溶剂-催化剂体系可以循环使用几次,而催化活性没有明显损失。