(2R,3S)-3-(dimethyl(phenyl)silyl)-2-hydroxypent-4-en-1-yl 2,4,6-trimethylbenzenesulfonate

(2R,3S)-3-(dimethyl(phenyl)silyl)-2-((trimethylsilyl)oxy)pent-4-en-1-yl 2,4,6-trimethylbenzenesulfonate

benzyl 2-((2R,6S)-6-((S)-2-(benzyloxy)-4-oxobutyl)tetrahydro-2H-pyran-2-yl)-2-methylpropanoate

B-crotyldiisopinocampheylborane

benzyl 2-((2R,6S)-6-((R)-2-(benzyloxy)pent-4-en-1-yl)tetrahydro-2H-pyran-2-yl)-2-methylpropanoate