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An efficient and convenient procedure for direct esterification of alkyl and aryl silyl ethers with Ac 2 O and a catalyst system of perchloric acid immobilized on a silica gel (HClO 4 –SiO 2 ) has been developed. The silyl protecting groups are directly replaced by acetyls and the protecting groups themselves are transformed into acetates as the sole byproducts, which can be...
The transformation of acetonides into acetates is frequently required in synthetic chemistry. An efficient procedure for direct conversion of acetonides into acetates in the presence of HClO 4 –SiO 2 under mild conditions was developed. The acetonides of primary hydroxy groups are directly converted to diacetates, and the anomeric acetonides of furanosides are stereoselectively transformed...
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