CS(Cl)(=O)=O.[C:6]([O:10][C:11]([N:13]1[CH2:17][CH2:16][CH2:15][C@H:14]1[CH2:18]O)=[O:12])([CH3:9])([CH3:8])[CH3:7].C(N(CC)CC)C.[NH:27]1[CH2:32][CH2:31][O:30][CH2:29][CH2:28]1>C(Cl)Cl.C1(C)C=CC=CC=1>[C:6]([O:10][C:11]([N:13]1[CH2:17][CH2:16][CH2:15][C@H:14]1[CH2:18][N:27]1[CH2:32][CH2:31][O:30][CH2:29][CH2:28]1)=[O:12])([CH3:7])([CH3:8])[CH3:9]
Methanesulfonyl chloride (1.7 g, 14.9 mmol) was added dropwise to a solution of (S)-2-hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (1.5 g, 7.45 mmol) and triethylamine (753 mg mg, 7.45 mmol) in CH2Cl2 at 0° C. After 3 h reaction mixture was concentrated to give a white solid. The resulting solid was suspended in toluene, morpholine (1.3 g, 14.9 mmol) was added, and the resulting mixture was heated to 110° C. in a sealed tube. After 12 h the reaction mixture was concentrated, the resulting residue was dissolved in EtOAc and water, the layers were separated, and the aqueous was further extracted with EtOAc. The combined organic extracts were dried over Na2SO4, and the material was purified on silica gel by flash column chromatography CH2Cl2/MeOH/NH4OH (98.5/1/0.5) to afford the title compound as a white solid (800 mg, 40%). MS: 271.2 (MH+); HPLC Rf: n.d.; HPLC purity: n.d.
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