tert-butyl (-)-(3R,SS)-3-hydroxy-4-p-tolylsulfinyl-butanoate

tert-butyl (+)-(3R,4S)-4-formyl-3,4-isopropylidenedioxy-butanoate

dimethyl (+)-(3S,5S)-1-(tert-butyldimethylsilyloxy)-3,5-isopropylidenedioxy-7-oxo-octyl-8-phosphonate