Cu-Catalyzed Aerobic Oxidative Cyclizations of 3-<i>N</i>-Hydroxyamino-1,2-propadienes with Alcohols, Thiols, and Amines To Form α-<i>O</i>-,<i>S</i>-, and<i>N</i>-Substituted 4-Methylquinoline Derivatives
作者:Pankaj Sharma、Rai-Shung Liu
DOI:10.1002/chem.201406317
日期:2015.3.16
one‐pot, two‐step synthesis of α‐O‐, S‐, and N‐substituted 4‐methylquinoline derivatives through Cu‐catalyzed aerobic oxidations of N‐hydroxyaminoallenes with alcohols, thiols, and amines is described. This reaction sequence involves an initial oxidation of N‐hydroxyaminoallenes with NuH (Nu=OH, OR, NHR, and SR) to form 3‐substituted 2‐en‐1‐ones, followed by Brønsted acid catalyzed intramolecular cyclizations
描述了通过醇,硫醇和胺与铜催化的N-羟基氨基丙烯的好氧氧化反应,一锅,两步合成α- O-,S-和N-取代的4-甲基喹啉衍生物。该反应顺序涉及N的初始氧化与NuH(Nu = OH,OR,NHR和SR)形成的γ-羟基氨基丙烯形成3个取代的2 en 1 -1,然后由Brønsted酸催化所得产物的分子内环化。我们的机理分析表明,反应是通过自由基类型的机理进行的,而不是通过典型的硝酮中间体途径进行的。这种新的铜催化反应的实用性通过其对几种2-氨基-4-甲基喹啉衍生物的合成的适用性得到了证明,已知这些衍生物是几种生物活性分子的关键前体。