(4R,5R)-5-Bromomethyl-4-methyl-dihydro-furan-2-one

(4S,5S)-5-(hydroxymethyl)-4-methyldihydrofuran-2(3H)-one

2,3-dideoxy-3-C-methyl-5-O-tert-butyldiphenylsilyl-D-threo-pentono-1,4-lactone

(2R,3R,4S)-5-[(tert-butyldiphenylsilyl)oxy]-2-hydroxy-3-methyl-4-pentanolide

2,3-dideoxy-3-C-methyl-5-O-tert-butyldiphenylsilyl-D-glycero-pent-2-eno-1,4-lactone