4-fluoromethyl-5H-furan-2-one

(S)-dimethyl 2-(1-(tert-butoxy)-3-fluoropropan-2-yl)malonate

tert-butyl (S)-4-(tert-butoxy)-3-(fluoromethyl)butanoate

(S)-(5-oxotetrahydrofuran-3-yl)methyl 4-methylbenzenesulfonate

methyl (3R,4S)-4-(chloromethyl)-2-oxotetrahydrofuran-3-carboxylate