tert-butyl (4S)-5-carbamoyloxy-2,4-dimethylpent-2-enoate

tert-butyl 2R-2-iodo-[(4R,5R)-5-methyl-2-oxo[1,3]dioxan-4-yl]propionate

tert-butyl (2R)-2-[(4R,5R,6R)-6-[(1R)-2-tert-butyldiphenylsilyloxy-1-methylethyl]-5-methyl-2-oxo[1,3]dioxan-4-yl]propionate