Selective deprotection of alkyl esters using magnesium methoxide
作者:Xu Yao-Chang、Amsalu Bizuneh、Clint Walker
DOI:10.1016/0040-4039(95)02197-3
日期:1996.1
The use of magnesium methoxide for the deprotection of alkyl esters is described. This mild reagent provides a good method to cleave esters efficiently and more importantly, allows for effective differentiation between two different esters. The order of the reactivity of this reagent towards acyl cleavages was found to be: p-nitrobenzoate>acetate>benzoate>pivaloate>>acetamide.
Pivaloyloxy, benzyloxy and methoxy carbonyl groups remained intact and selective deprotection of TBS groups in the presence of other protectinggroups was accomplished. We succeeded in cleaving an acetyl group on a secondary alcohol in a highly polar nortropine derivative. Our findings here provide another deprotection option and would be helpful in the synthesis of multifunctional compounds. Graphical Abstract