The orthoester Johnson–Claisen rearrangement of allylic terpenols in the presence of acidic ionic liquid
作者:Galina V. Kryshtal、Galina M. Zhdankina、Nikolai V. Ignat’ev、Michael Schulte、Sergei G. Zlotin
DOI:10.1016/j.jfluchem.2016.01.005
日期:2016.3
A convenient protocol for the synthesis of natural isoprenoid-derived carboxylic esters via reaction of allylic terpenols with triethyl orthoacetate (propionate) in the presence of 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6] (10 mol%), has been developed. The desired terpene derivatives were prepared in moderate to high yield. The ionic liquid (IL) can be easily separated from the