Add time:09/25/2019 Source:sciencedirect.com
The synthesis of 2,3:4,5-dianhydro-1,6-dibromo-1,6-dideoxy-D-iditol and -galactitol and some of their derivatives, starting from 1,6-dibromo-1,6-dideoxy-3,4-O-isopropylidene-D-mannitol, is described. The galactitol derivative was formed via 3,5-di-O-acetyl-1,6-dibromo-1,6-dideoxy-D-mannitol, an unusual acyl-migration product of the corresponding 2,5-diacetate. The mechanism of this acyl migration is discussed.
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