Oxidative ring expansion of 3-hydroxy-3-phenacyloxindoles using phenyliodine diacetate and molecular iodine: Synthesis of 2-hydroxy-2-aryl/alkyl-2,3-dihydroquinolin-4(1H)-ones
作者:Ashish C. Kavale、Amit H. Kalbandhe、Imran A. Opai、Atul A. Jichkar、Nandkishor N. Karade
DOI:10.1016/j.tetlet.2020.152631
日期:2021.1
Oxidation of tertiary alcohol of the type 3-hydroxy-3-phenacyloxindoles using the combination of phenyliodine diacetate and molecular iodine in methanol results in oxidative cleavage of C2-C3 bond to form isocyanate as an intermediate with its subsequent trapping by methanol to form ortho-carbamates of 1,3-diaryl carbonyl compounds which further undergoes concurrent cyclization to furnish 2-hydroxy-2-aryl/alkyl-2
使用苯乙酸二乙酸酯和分子碘在甲醇中对3-羟基-3-苯并氧杂吲哚类的叔醇进行氧化会导致C2-C3键的氧化裂解,形成异氰酸酯作为中间体,随后被甲醇捕获而形成邻位- 1,3-二芳基羰基化合物的氨基甲酸酯,进一步进行同时环化,以高收率提供2-羟基-2-芳基/烷基-2,3-二氢喹啉-4(1 H)-ones衍生物。