A Green Protocol for Catalytic Conversion of Epoxides to 1,2-Diacetoxy Esters with Phosphomolybdic Acid Alone or Its Supported on Silica Gel
作者:Behzad Zeynizadeh、Leila Sadighnia
DOI:10.5012/bkcs.2010.31.9.2644
日期:2010.9.20
The preparation of epoxi-des is easy and because of their ring strain they are capable of reacting with various nucleophiles to afford 1,2-difunctional products. Among these, 1,2-diols and 1,2-diacetoxy esters (1,2- diacetates) possess valuable synthetic utilities. Ordinarily, nu-cleophilic ring opening of epoxides with water in the presence of Lewis or Bronested acids leads to 1,2-diol products, and
环氧化物的制备很容易,并且由于它们的环应变,它们能够与各种亲核试剂反应以提供 1,2-双功能产物。其中,1,2-二醇和1,2-二乙酰氧基酯(1,2-二乙酸酯)具有有价值的合成用途。通常,在路易斯酸或布朗斯台德酸存在下,环氧化物与水的亲核开环会产生 1,2-二醇产物,随后通过乙酰氯的乙酰化产生 1,2-二乙酰氧基酯。在一种简单的方法中,环氧化物可以在促进剂存在下与乙酸酐直接转化为 1,2-二乙酸酯。由于 1,2-二乙酰氧基酯的合成用途,特别是用于保护 1,2-二醇,