ethyl (3R,4S,5R)-3,4-O-thionyl-5-O-methanesulfonylshikimate

ethyl (3S,4R,5R)-3-azido-4-hydroxy-5-methanesulfonyloxycyclohex-1-ene-1-carboxylate

ethyl (4R)-4-((2S,3R)-3-((tert-butyldimethylsilyloxy)methyl)oxiran-2-yl)-4-hydroxy-2-methylenebutanoate

ethyl (4R)-4-((2S,3R)-3-((tert-butyldimethylsilyloxy)methyl)oxiran-2-yl)-4-(methoxymethoxy)-2-methylenebutanoate

ethyl (4R)-4-((2S,3R)-3-(hydroxymethyl)oxiran-2-yl)-4-(methoxymethoxy)-2-methylenebutanoate