[C:1]([O:16][C@@H:17]([CH3:42])[C@H:18]([NH:31][C:32]([O:34][CH2:35][C:36]1[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=1)=[O:33])[C:19]([NH:21][CH2:22][CH2:23][CH:24](OCC)[O:25]CC)=[O:20])(=[O:15])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH3:14].Cl.C(=O)(O)[O-].[Na+]>O1CCCC1>[C:1]([O:16][C@@H:17]([CH3:42])[C@H:18]([NH:31][C:32]([O:34][CH2:35][C:36]1[CH:37]=[CH:38][CH:39]=[CH:40][CH:41]=1)=[O:33])[C:19](=[O:20])[NH:21][CH2:22][CH2:23][CH:24]=[O:25])(=[O:15])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH3:14]To a solution of (1S,2S)-2-{[(benzyloxy)carbonyl]amino}-3-[-(3,3-diethoxypropyl)amino]-1-methyl-3-oxopropyl myristate (1.06 g, 1.79 mmol, obtained from Reference Example 47) in anhydrous tetrahydrofuran was added 0.5 N hydrochloric acid (4.3 ml). The resulting solution was stirred at room temperature for 5 hours. The reaction mixture was brought to pH 9 with aqueous sodium bicarbonate, extracted with ethyl acetate (3×75 ml), the combined organics were washed with saturated sodium chloride, dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was chromatographed (flash column, silica gel, 45% ethyl acetate in hexane) to provide (1S,2S)-2-{[(benzyloxy)carbonyl]amino}-1-methyl-3-oxo-3-[(3-oxopropyl)amino]propyl myristate (694 mg, 75%) as a white solid.
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