A Regio- and Stereoselective Carbonylative Approach to Alkyl (<i>Z</i>
)-2-[3-Oxoisobenzofuran-1-(3<i>H</i>
)-ylidene]acetates
作者:Raffaella Mancuso、Ida Ziccarelli、Francesco Fini、Nicola Della Ca'、Nadia Marino、Carla Carfagna、Bartolo Gabriele
DOI:10.1002/adsc.201801308
日期:2019.2.19
The first example of the oxidative carbonylation of 2‐ethynylbenzoic acid derivatives, leading to alkyl (Z)‐2‐[3‐oxoisobenzofuran‐1‐(3H)‐ylidene]acetates in a regio‐ and stereoselective manner, is reported. Under the catalytic action of PdI2 (2 mol%) in conjuction with KI (20 mol%), different 2‐[(trimethylsilyl)ethynyl]benzoic acids were converted into the corresponding isobenzofuranones in high to
据报道,第一个例子是2-乙炔基苯甲酸衍生物的氧化羰基化反应,以区域和立体选择性方式生成烷基(Z)-2- [3-氧代异苯并呋喃-1-(3 H)-亚烷基]乙酸酯。在PdI 2(2 mol%)与KI(20 mol%)结合的催化作用下,将不同的2-[((三甲基甲硅烷基)乙炔基]苯甲酸]转化为相应的异苯并呋喃酮,产率高至优异(70-98%) 。拟议的反应机制涉及syn 5- exo- dig环化,一氧化碳插入和酒精的亲核取代。在反应条件下发生甲硅烷基化。代表性产品的结构,即甲基(ZXRD分析证实了)-2- [3-氧代异苯并呋喃-1(3 H)-亚基]乙酸酯。