Trifluoro-methanesulfonic acid (3aR,6R,7R,7aR)-7-(tert-butyl-dimethyl-silanyloxy)-2,2-dimethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran-6-ylmethyl ester

3-(4-methoxybenzyloxy)propyne

(3aR,6R,7R,7aR)-tetrahydro-(7-(tert-butyldimethylsilyl)oxy-2,2-dimethyl-3aH-[1,3]dioxolo[4,5-c]pyran-6-yl)methanol

(2R,3S)-3-(tert-Butyl-dimethyl-silanyloxy)-2-(tert-butyl-dimethyl-silanyloxymethyl)-3,6-dihydro-2H-pyran