Synthesis of N-acylated 7-amino-2,6,7-trideoxy-d-erythroheptopyranosides from methyl α-d-mannoside

Synthesis of novel σ-receptor ligands from methyl α-d-mannopyranoside

For the first time a monosaccharide (methyl alpha-D-mannopyranoside) has been used as starting material for the synthesis of novel sigma-receptor ligands. The hept-3-ulopyranoside dimethyl ketals 14 and 15 were obtained from the nitrile 7 via two synthetic routes. After selective hydrolysis of the ketone dimethyl acetal, various amino substituents were introduced into position 3. High sigma(1)-receptor affinity and selectivity was attained with equatorially arranged amino substituents in position 3 and a dichlorophenylacetamide moiety in position 7. The anomeric mixture of dimethylamines 26alpha/beta displayed the highest sigma(1)-receptor affinity (K(i)=21nM) within this small series of test compounds.

A simple and mild synthesis of a 4,5-cyclopropanated carbohydrate

The synthesis of a 4,5-cyclopropanated carbohydrate was achieved in five steps from methyl alpha-D-mannopyranoside under mild conditions that avoid the use of carbene chemistry.