Synthesis and biological activity of acyclic anlogues of nojirimycin
摘要:
A series of acyclic compounds has been prepared which comprises compounds that mimic key structural elements of nojirimycin 1 and 1-deoxynojirimycin 2, both of which are highly effective glucosidase inhibitors, in order to ascertain if similar biological activity can be obtained with simpler structures. All of the compounds are competitive inhibitors of yeast alpha-glucosidase. with varying degrees of effectiveness, but none of them, in contrast to 1-deoxynojirimycin 2, show significant anti-HIV activity.
Two rare sugars – 1-deoxy-L-fructose and L-sorbose – were synthesized from inexpensive starting materials by a carbonyltranslocationmethod developed in our laboratory. Reduction of a known starting compound gave a 1,5-diol derivative. Selective protection of the corresponding primary alcohol and oxidation of the secondary alcohol provided the desired product in acyclic, protected form. Subsequent
Two synthetic routes to a carbocyclic precursor to valienamine are reported, startingfrom either D-glucose or L-sorbose and using ring-closing metathesis as a key step. A low-yielding synthesis of 1-epi-valienamine is reported. Results from an abortive third possible route to valienamine based on an early introduction of nitrogen are discussed.