[CH3:1][N:2]([C@@H:23]([C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)[CH2:24][CH3:25])[C:3]([C:5]1[N:6]=[C:7]([CH:10]2[CH2:15][CH2:14][N:13](C(OC(C)(C)C)=O)[CH2:12][CH2:11]2)[S:8][CH:9]=1)=[O:4].Cl>CCOCC.O1CCOCC1>[CH3:1][N:2]([C@@H:23]([C:26]1[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=1)[CH2:24][CH3:25])[C:3]([C:5]1[N:6]=[C:7]([CH:10]2[CH2:15][CH2:14][NH:13][CH2:12][CH2:11]2)[S:8][CH:9]=1)=[O:4]1,1-Dimethylethyl 4-[4-[[methyl[(1R)-1-phenylpropyl]amino]carbonyl]-2-thiazolyl]-1-piperidinecarboxylate (i.e. the product of Example 1, Step D) (3.6 g, 8.1 mmol) was dissolved in 100 mL of ether and treated with 20 mL of 4 N HCl in dioxane. The reaction mixture was stirred at ambient temperature for 4 h during which time a precipitate formed and was collected. The mother liquid was concentrated under reduced pressure, treated with 20 mL of 4 N HCl in dioxane, stirred at ambient temperature for 1 h and concentrated under reduced pressure. The residue was combined with the previously collected precipitate, dissolved in water and washed with ether. The aqueous layer was basified with 1 N aqueous NaOH solution and extracted with ethyl acetate. The extract was dried over MgSO4 and concentrated under reduced pressure to give 2.33 g of the title compound as an orange oil suitable for use in subsequent reactions.
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