Chlorination of 1,5-anhydro-4,6,-o-benzylidene-2,3-dideoxy-3-nitro-D-arabino-hex-1-enitol; highly stereoselective preparation of α-D-glucopyranosyl chloride and ω-chloroalkyl β-D-glucopyranosides
Abstract
Chlorination of 1,5-anhydro-4,6-O-benzylidene-2,3-dideoxy-3-nitro-D-arabino-hex-1-enitol in cyclic ethers such as tetrahydrofuran stereoselectively afforded the ω-chloroalkyl β-D-glycopyranoside derivatives, whereas in 1,4-dioxane α-D-glycopyranosyl chloride was obtained in high yield.