Abstract
Indium trichloride in an acetonitrile-water mixture chemoselectively cleaved the isopropylidene acetals of various 1,3-dioxolanyl-substituted 1,2-oxazines as well as carbohydrate derivatives. Deprotection of acetonides can be achieved in substrates susceptible for acid-induced cyclizations. Most importantly, enol ether moieties are not attacked and the presence of glycosidic linkages or acid-sensitive protecting groups such as tert-butyldimethylsilyl, 2-(trimethylsilyl)ethyl, or tert-butoxycarbonyl is also tolerated.
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