C([O:9][CH:10]1[CH2:13][N:12]([C:14]2[O:15][CH:16]=[C:17]([C:19]([O:21][CH3:22])=[O:20])[N:18]=2)[CH2:11]1)(=O)C1C=CC=CC=1.C[O-].[Na+].Cl>CO.C(Cl)Cl.O1CCOCC1>[OH:9][CH:10]1[CH2:13][N:12]([C:14]2[O:15][CH:16]=[C:17]([C:19]([O:21][CH3:22])=[O:20])[N:18]=2)[CH2:11]1To a solution of 3-benzoyloxy-1-(4-methoxycarbonyl-1,3-oxazol-2-yl)azetidine (5.24 g, 17.3 mmol) (obtained as described in Reference Example 70(6)) in a mixture of methanol (260 ml) and methylene chloride (80 ml) was added a catalytic amount of sodium methoxide at room temperature and the mixture was stirred for 1 hour. After checking the completion of the reaction, the mixture was neutralized with 4 N hydrogen chloride gas in dioxane and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using methylene chloride:methanol (95:5) as the eluant to afford 3-hydroxy-1-(4-methoxycarbonyl-1,3-oxazol-2-yl)azetidine (2.65 g, yield 77%) as pale brown crystals.
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