4-[4-acetoxy-6-(4-bromomethylene-6-vinyl-tetrahydro-pyran-2-ylmethyl)-6-methoxy-5,5-dimethyl-tetrahydro-pyran-2-yl]-3-hydroxy-butyric acid methyl ester

(S)-5-hydroxy-6-((4R,5R)-2,2,5-trimethyl-[1,3]dioxolan-4-yl)-hex-2-ynoic acid methyl ester

4-[4-acetoxy-6-(4-bromomethylene-6-vinyl-tetrahydro-pyran-2-ylmethyl)-6-methoxy-5,5-dimethyl-tetrahydro-pyran-2-yl]-3-hydroxy-butyric acid

4-[4-acetoxy-6-methoxy-6-(4-methoxycarbonylmethylene-6-vinyl-tetrahydro-pyran-2-ylmethyl)-5,5-dimethyl-tetrahydro-pyran-2-yl]-3-hydroxy-butyric acid

E-7-(tert-butyl-dimethyl-silanyloxy)-3-[2-hydroxy-3-(2,2,5-trimethyl-[1,3]dioxolan-4-yl)-propyl]-6,6-dimethyl-hept-2-en-4-ynoic acid methyl ester

methyl (R)-4-((2S,4S,6S)-4-acetoxy-6-(((2S,6R,Z)-4-(bromomethylene)-6-formyltetrahydro-2H-pyran-2-yl)methyl)-6-methoxy-5,5-dimethyltetrahydro-2H-pyran-2-yl)-3-((tert-butyldiphenylsilyl)oxy)butanoate

tert-butyl((2,2-dimethylbut-3-yn-1-yl)oxy)dimethylsilane

4-[(S)-4-acetoxy-6-((2S,6R)-4-bromomethylene-6-vinyl-tetrahydro-pyran-2-ylmethyl)-6-methoxy-5,5-dimethyl-tetrahydro-pyran-2-yl]-3-(tert-butyl-diphenyl-silanyloxy)-butyric acid methyl ester