Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A protected 2-azido-2-deoxymannose is a key intermediate in the synthesis of alexine [(1R,2R,3R,7S,8S)-3-hydroxymethyl-1,2,7-trihydroxypyrrolizidine], 3-epialexine and 7-epialexine from D-glucose. ... A protected 2-azido-2-deoxymannose is a key intermediate in the ...