Dess-Martin Periodinane Mediated Intramolecular Cyclization of Phenolic Azomethines: A Solution-Phase Strategy toward Benzoxazoles and Benzothiazoles
作者:D. Bose、Mohd. Idrees
DOI:10.1055/s-0029-1217136
日期:2010.2
Dess-Martin periodinane (DMP), a highly versatile hypervalent iodine(V) reagent, was found to efficiently mediate the intramolecular cyclization of phenolic azomethines/Schiff bases at ambient temperature leading to the rapid and expeditious synthesis of substituted benzoxazoles and benzothiazoles. Furthermore, a solution-phase strategy has been developed by treating the reaction mixtures sequentially with Amberlyst A-26 thiosulfate resin and diisopropylaminomethyl resin (PS-DIEA), which remove excess reagent and byproducts, to give pure products.
研究发现,Dess-Martin periodinane(DMP)是一种用途广泛的高价碘(V)试剂,可在常温下有效地介导酚偶氮甲烷/席夫碱的分子内环化反应,从而快速合成取代的苯并恶唑和苯并噻唑。此外,还开发了一种溶液相策略,即用 Amberlyst A-26 硫代硫酸盐树脂和二异丙基氨基甲基树脂(PS-DIEA)依次处理反应混合物,从而去除多余的试剂和副产品,得到纯净的产品。