Glycosylations of Glycals
using <i>N</i>‑Iodosuccinimide (NIS) and Phosphorus
Compounds for Syntheses
of 2‑Iodo- and 2‑Deoxyglycosides
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Abstract
The glycosylations
of glycals and alcohols using <i>N</i>-iodosuccinimide (NIS)
and a catalytic amount of PPh<sub>3</sub> effectively
proceeded under mild conditions to provide the corresponding 2-deoxy-2-iodoglycosides
in high yields. The reactivity of the iodoglycosylations with PPh<sub>3</sub> significantly increased in comparison to that using NIS alone
as an activator. In addition, the glycosylations of glycals and alcohols
using catalytic amounts of NIS and P(OPh)<sub>3</sub> were effectively
realized to give the corresponding 2-deoxyglycosides in high yields