[C:1]([O:5][C:6]([NH:8][CH2:9][C:10]([OH:12])=O)=[O:7])([CH3:4])([CH3:3])[CH3:2].ClC(OCC)=O.[NH2:19][C:20]1[CH:27]=[CH:26][CH:25]=[C:24]([CH3:28])[C:21]=1[CH2:22][OH:23].C(=O)([O-])O.[Na+]>C(Cl)Cl.C(N(CC)CC)C>[C:1]([O:5][C:6]([NH:8][CH2:9][C:10]([NH:19][C:20]1[CH:27]=[CH:26][CH:25]=[C:24]([CH3:28])[C:21]=1[CH2:22][OH:23])=[O:12])=[O:7])([CH3:2])([CH3:3])[CH3:4]To a solution of t-butoxycarbonylaminoacetic acid (3.5 g) in methylene chloride (50 ml) was added triethylamine (2.0 g) and then ethyl chloroformate (1.9 ml) with ice-cooling. After being stirred for 1 hour, 2-amino-6-methylbenzyl alcohol (2.74 g) was added thereto and the mixture was stirred for 7 days at an ambient temperature. To the mixture was added a saturated aqueous solution of sodium hydrogen carbonate and the organic layer was separated, washed with water and dried over magnesium sulfate. The solvent was distilled off and the residue was triturated with diethyl ether to give 2-(t-butoxycarbonylaminoacetamido)-6-methylbenzyl alcohol (1.04 g).
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