Catalytic Carbonylative Double Cyclization of 2-(3-Hydroxy-1-yn-1-yl)phenols in Ionic Liquids Leading to Furobenzofuranone Derivatives
作者:Raffaella Mancuso、Rossana Miliè、Antonio Palumbo Piccionello、Diego Olivieri、Nicola Della Ca’、Carla Carfagna、Bartolo Gabriele
DOI:10.1021/acs.joc.9b00952
日期:2019.6.7
between readily available 2-(3-hydroxy-1-yn-1-yl)phenols, CO, and oxygen carried out in the presence of catalytic amounts of PdI2 (1 mol %) in conjunction with KI (20 mol %) and 2 equiv of diisopropylethylamine at 80 °C for 24 h under 30 atm of a 1:4 mixture of CO–air. Interestingly, the process was not selective when carried out in classical organic non-nucleophilic solvents (such as MeCN or DME), leading
报道了一种催化羰基双环化法合成呋喃并[3,4- b ]苯并呋喃-1(3 H)-ones。它基于在催化量的PdI 2(1 mol%)与KI结合存在下易得的2-(3-羟基-1-yn-1-基)苯酚,CO和氧之间的反应(20摩尔%)和2当量的二异丙基乙胺在80℃,1:4的CO-空气混合物的30个大气压下进行24小时。有趣的是,当在经典的有机非亲核溶剂(如MeCN或DME)中进行时,该方法没有选择性,导致苯并呋喃呋喃酮衍生物和苯并呋喃的混合物源于简单的环异构化,而对形成苯并呋喃具有化学选择性。 BmimBF中的双环化化合物4作为反应介质。而且,含有催化剂的离子液体溶剂可以容易地循环几次而没有明显的活性损失。