Pd-Catalyzed Cross-Coupling of Aryl Carboxylic Acids with Propiophenones through a Combination of Decarboxylation and Dehydrogenation
作者:Jun Zhou、Ge Wu、Min Zhang、Xiaoming Jie、Weiping Su
DOI:10.1002/chem.201200829
日期:2012.6.25
A Heck of a reaction: With a PCy3‐supported Pd catalyst, arylcarboxylicacids cross‐couple to saturated propiophenonesthrough a combination of decarboxylation and dehydrogenation to give chalcones bearing a variety of functional groups in generally good yields (see scheme). Furthermore, a one‐pot procedure, involving this reaction and a subsequent selective hydrogenative cyclization process, has
Cu(I)-Catalyzed and Base-Promoted [5 + 2 + 1] Cascade Cyclization of 2-Nitrochalcones with Aliphatic Primary Amines to 5<i>H</i>-Pyrimido[5,4-<i>b</i>]indole Frameworks
An unprecedented [5 + 2 + 1] cascadecyclization to the preparation of 5H-pyrimido[5,4-b]indole derivatives has been disclosed. The novel protocol of 2-nitrochalcones reacted with aliphatic primary amines catalyzed by CuI and promoted by Cs2CO3, which underwent a critical intermediate 2,3-disubstituted indole, providing structurally diverse 5H-pyrimido[5,4-b]indoles in generally high yields (77–90%)
已经公开了一种前所未有的 [5 + 2 + 1] 级联环化制备 5 H-嘧啶并[5,4- b ]吲哚衍生物。2-硝基查尔酮的新方案与由 CuI 催化并由 Cs 2 CO 3促进的脂肪族伯胺反应,其经历了关键的中间体 2,3-二取代吲哚,提供了结构多样的 5 H-嘧啶并[5,4 - b ]吲哚产率普遍较高(77-90%)和底物范围广泛(34 个例子)。