S=[C:2]1[NH:6][C:5]2[CH:7]=[C:8]([C:11]([O:13][CH3:14])=[O:12])[CH:9]=[CH:10][C:4]=2[O:3]1.[N:15]1([CH:21]2[CH2:26][CH2:25][NH:24][CH2:23][CH2:22]2)[CH2:20][CH2:19][CH2:18][CH2:17][CH2:16]1>C1(C)C(C)=CC=CC=1.ClCCl>[N:15]1([CH:21]2[CH2:26][CH2:25][N:24]([C:2]3[O:3][C:4]4[CH:10]=[CH:9][C:8]([C:11]([O:13][CH3:14])=[O:12])=[CH:7][C:5]=4[N:6]=3)[CH2:23][CH2:22]2)[CH2:20][CH2:19][CH2:18][CH2:17][CH2:16]1Methyl 2-thioxo-2,3-dihydrobenzo[d]oxazole-5-carboxylate (Example 94A, 300 mg, 1.43 mmol) and 1,4′-bipiperidine (483 mg, 2.87 mmol) were combined in xylene (2 mL). The mixture was heated in a microwave to 130° C. for 20 minutes. The reaction mixture was diluted with dichloromethane, washed with water, and the organic layer was absorbed on silica gel. The crude mixture was purified using silica gel chromatography (40 g column) eluting with a gradient of methanol/dichloromethane (3-18%) to afford the title compound. 1H NMR (300 MHz, CDCl3) δ ppm 1.38-1.50 (m, 2 H) 1.54-1.72 (m, 5 H) 1.95 (d, J=12.89 Hz, 2 H) 2.46-2.59 (m, 6 H) 3.03-3.16 (m, 2 H) 3.91 (s, 3 H) 4.32-4.36 (m, 1 H) 4.36-4.41 (m, 1 H) 7.25 (d, 1 H) 7.79 (dd, J=8.48, 1.70 Hz, 1 H) 8.00 (d, J=1.70 Hz, 1 H); MS (ESI+) m/z 344.3 (M+H)+.
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