β-Stereoselective Phosphorylations Applied to the Synthesis of ADP- and Polyprenyl-β-Mannopyranosides

An efficient and convenient synthetic route to glycosyl 1-beta-phosphates has been developed using diallyl chlorophosphate as a phosphorylating agent with 4-N,N-dimethylaminopyridine under mild conditions. Diallyl-glycosyl 1-beta-phosphate triesters of d-manno, l-glycero-d-manno-hepto-, d-gluco-, d-galacto-, and l-fuco-pyranose as well as lactose have been obtained by this strategy in good yields and excellent beta-selectivities. Furthermore, the diallyl 6-azido-mannosyl 1-beta-phosphate 2 was deprotected under mild conditions and converted into potentially clickable analogues of beta-mannosyl phosphoisoprenoids I and ADP-heptose II.