New Synthetic Route for the Preparation of 4-Phenylthio-4-butanolide Derivatives by the Use of the Pummerer Rearrangement
作者:Mikio Watanabe、Seijin Nakamori、Hatsue Hasegawa、Kozo Shirai、Takanobu Kumamoto
DOI:10.1246/bcsj.54.817
日期:1981.3
The Pummerer rearrangement reaction of 2- or 3-substituted 4-(phenylsulfinyl) butyric acids in the presence of an excess amount of acetic anhydride and a catalytic amount of p-toluenesulfonic acid in refluxing toluene for 1 h afforded 2- or 3-substituted 4-phenylthio-4-butanolide (17a–f). Thermolysis in pyridine of 4-phenylsulfinyl 4-butanolides, which were prepared by oxidation of 17a–f, afforded
在过量乙酸酐和催化量的对甲苯磺酸存在下,2-或3-取代的4-(苯亚磺酰基)丁酸在甲苯回流1小时后发生Pummerer重排反应,得到2-或3-取代的4-苯硫基-4-丁内酯(17a-f)。通过氧化 17a-f 制备的 4-苯基亚磺酰基 4-丁醇内酯在吡啶中热解,得到 2-或 3-取代的 2-或 3-丁烯-4-内酯。