Palladium-Catalyzed Carbonylative Cyclization of Unsaturated Aryl Iodides and Dienyl Triflates, Iodides, and Bromides to Indanones and 2-Cyclopentenones
作者:Steve V. Gagnier、Richard C. Larock
DOI:10.1021/ja0212009
日期:2003.4.1
carbonylative cyclization is particularly effective on substrates that contain a terminal olefin. The proposed mechanism for this annulation includes (1) Pd(OAc)(2) reduction to the active palladium(0) catalyst, (2) oxidative addition of the organic halide or triflate to Pd(0), (3) coordination and insertion of carbon monoxide to produce an acylpalladium intermediate, (4) acylpalladation of the neighboring
通过钯催化的不饱和芳基碘化物和二烯基三氟甲磺酸酯、碘化物和溴化物的羰基化环化反应,分别以良好到优异的产率成功制备了茚酮和 2-环戊烯酮。通过使用 10 mol% Pd(OAc)(2)、2 当量吡啶、1 当量 n-Bu(4)NCl、1 atm CO、100 摄氏度反应温度和 DMF 获得最佳结果作为溶剂。这种羰基化环化对含有末端烯烃的底物特别有效。这种环化的建议机制包括(1)Pd(OAc)(2)还原为活性钯(0)催化剂,(2)有机卤化物或三氟甲磺酸盐与Pd(0)的氧化加成,(3)配位和插入一氧化碳生成酰基钯中间体,