Molybdenum catalysts are efficient and selective catalysts for the tandem epoxidation/alcoholysis or epoxidation/hydrolysis of glucal and galactal derivatives. In glucal derivatives the selectivity is mainly controlled by the allylic substituent at position 3 of the glycal, obtaining in general the products derived from the initial formation of the α-epoxide (gluco) when this hydroxy group is protected, while
Easy and Stereoselective One-Step Incorporation of Two Asymmetric Carbons in Pyranose Derivatives to Acyclic Epoxyamides: New, Potentially Useful Acyclic Chiral Templates
作者:F. J. López-Herrera、A. M. Heras-López、M. S. Pino-González、F. Sarabia García
DOI:10.1021/jo961017w
日期:1996.1.1
resulting trans-epoxyamides was determined by comparing the IR, NMR, and polarimetric data with another epoxyamide of known configuration. We attempted to explain the stereochemistry of the major products by proposing a preferential conformation for the different starting aldehyde sugars in the basic reaction medium that took into account, at first, the principal electrical interactions between the carbonyl