[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([C:14]([OH:16])=O)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.[C:41]([NH2:44])(=[S:43])[CH3:42].C(N(C(C)C)CC)(C)C>ClCCl>[C:41]([NH:44][C:14]([CH:11]1[CH2:10][CH2:9][N:8]([C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])[CH2:13][CH2:12]1)=[O:16])(=[S:43])[CH3:42]
1-(tert-Butoxycarbonyl)piperidine-4-carboxylic acid (2.213 g, 9.65 mmol), HATU (4.050 g, 10.65 mmol) and thioacetamide (1.597 g, 21.26 mmol) were mixed in anhydrous dichloromethane (25 mL). The reaction mixture was stirred at room temperature for 30 min. N,N-diisopropyl-N-ethylamine (5.3 mL, 30.3 mmol) was added and the reaction mixture was stirred at room temperature for 16 h. The solution was concentrated and the crude residue was purified on SiO2 (10 to 60% ethyl acetate, hexanes) to afford the title compound, which was used without further purification. HPLC/MS: 112.1 (M−174), Rt=3.00 (LC4).
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