(2S,3R,5R)-3,5-bis((tert-butyldimethylsilyl)oxy)-2-methylhept-6-enal

ethyl (4S,5R,7R)-5,7-bis((tert-butyldimethylsilyl)oxy)-4-methyl-3-oxonon-8-enoate

ethyl 2-((2R,3S,4R,6R)-4-hydroxy-2-methoxy-3-methyl-6-vinyltetrahydro-2H-pyran-2-yl)acetate

ethyl 2-((2R,3S,6R)-2-methoxy-3-methyl-4-oxo-6-vinyltetrahydro-2H-pyran-2-yl)acetate

ethyl 2-((2R,3S,4S,6R)-4-hydroxy-2-methoxy-3-methyl-4-((trimethylsilyl)methyl)-6-vinyltetrahydro-2H-pyran-2-yl)acetate