2,2'-dimethyl-1-(4'(R)-1',3'-dioxacyclopentyl)-but-3-yn-1(S/R)-ol

2-deoxy-3-O-(tert-butyldiphenylsilyl)-4,5-O-isopropylidene-D-erythro-pentose diethyl dithioacetal

tert-Butyl-[(S)-1-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-but-3-ynyloxy]-diphenyl-silane

(S)-5-(tert-Butyl-diphenyl-silanyloxy)-5-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-pent-2-ynoic acid ethyl ester

(S)-5-((R)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-5-hydroxy-pent-2-ynoic acid ethyl ester