“…[α] D 25 − 7 (c 0. ((3S,3aS,6R,6aR)-3a-Acetamidohexahydrofuro[3,4-b]furan-3,6-diyl)bis(methylene)diacetate (41). Isoxazolidine ring cleavage, followed by debenzylation and acetylation, was carried out, following the procedure as described in 40, using 32 (500 mg, 1.36 mmol) in MeOH (20 mL), Pd/C (10%, 80 mg), pyridine (20 mL), Ac 2 O (0.81 mL), and DMAP (pinch).…”