A facile synthesis of Uhle’s ketone starting from 3-(indol-3-yl)propionic acid is described. In the presence of a large amount of donor-acceptor complex, the species generated from chloroacetyl chloride and aluminum chloride, 3-(1-trimethylacetylindol-3-yl)propionyl chloride reacts regioselectively to give trimethylacetyl derivative of Uhle’s ketone in 78% yield. Deacylation of trimethylacetyl group gives Uhle’s ketone in an overall yield of 67%.
本研究描述了以 3-(
吲哚-3-基)
丙酸为起点的 Uhle 酮的简便合成方法。在大量供体-受体复合物(由
氯乙酰氯和
氯化铝生成)的存在下,3-(1-三甲基乙酰基
吲哚-3-基)
丙酰氯发生区域选择性反应,生成三甲基乙酰基衍
生物乌尔酮,收率为 78%。对三甲基乙酰基进行脱乙酰基反应可得到 Uhle 酮,总产率为 67%。