反应详情

(1S,2S,3S,5R,6S)-3′-((Allyloxy)carbonyl)-3-fluoro-5′-oxospiro[bicyclo[3.1.0]hexan-2,4′-oxazolidine]-6-carboxylic acid (A-1-2, 1.43 g) and 1-chloroethyl isobutyrate (1.80 g) were treated in the same manner as in Example A-1 (3) to give (1S,2S,3S,5R,6S)-3′-allyl 6-(1-(isobutyryloxy)ethyl) 3-fluoro-5′-oxospiro[bicyclo[3.1.0]hexan-2,4′-oxazolidine]-3′,6-dicarboxylate (A-8-1, 307 mg) as a pale yellow oil.