Trifluoroacetic acid → 5-(2-Fluoro-4-(methylsulfonyl)phenyl)-2-(piperidin-4-yl)-benzo[d]oxazole 2,2,2-trifluoroacetate

HRID 710119Notes

Reaction equation

HRID 710119 reaction equation
[F:1][C:2]1[CH:7]=[C:6]([S:8]([CH3:11])(=[O:10])=[O:9])[CH:5]=[CH:4][C:3]=1[C:12]1[CH:13]=[CH:14][C:15]2[O:19][C:18]([CH:20]3[CH2:25][CH2:24][N:23](C(OC(C)(C)C)=O)[CH2:22][CH2:21]3)=[N:17][C:16]=2[CH:33]=1.[F:34][C:35]([F:40])([F:39])[C:36]([OH:38])=[O:37]>C(Cl)Cl>[F:34][C:35]([F:40])([F:39])[C:36]([OH:38])=[O:37].[F:1][C:2]1[CH:7]=[C:6]([S:8]([CH3:11])(=[O:9])=[O:10])[CH:5]=[CH:4][C:3]=1[C:12]1[CH:13]=[CH:14][C:15]2[O:19][C:18]([CH:20]3[CH2:25][CH2:24][NH:23][CH2:22][CH2:21]3)=[N:17][C:16]=2[CH:33]=1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 71114584Tert-butyl 4-{5-[2-fluoro-4-(methylsulfonyl)phenyl]benzo[d]oxazol-2-yl}piperidine-1-carboxylate

Product 1

HCID 710895675-(2-Fluoro-4-(methylsulfonyl)phenyl)-2-(piperidin-4-yl)-benzo[d]oxazole 2,2,2-trifluoroacetate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Tert-butyl 4-{5-[2-fluoro-4-(methylsulfonyl)phenyl]benzo[d]oxazol-2-yl}piperidine-1-carboxylate (200 mg, 0.42 mmol) dissolved in DCM and added Trifluoroacetic acid (0.75 ml). This mixture was stirred at rt for 2 h. DCM removed from the reaction mixture to obtain 5-(2-fluoro-4-(methylsulfonyl)phenyl)-2-(piperidin-4-yl)benzo[d]oxazole 2,2,2-trifluoroacetate (190 mg). 5-(2-fluoro-4-(methylsulfonyl)phenyl)-2-(piperidin-4-yl)-benzo[d]oxazole 2,2,2-trifluoroacetate (190 mg, 0.39 mmol) was dissolved in DCM (20 ml) and added TEA (0.43 ml, 3.12 mmol). This mixture stirred at rt for 30 mins and added isopropyl chloroformate in toluene (0.095 g, 0.78 mmol). After 1 h, reaction mass diluted with water and extracted with DCM. Removal of DCM afforded crude. Crude was purified by combiflash using a mixture of EtOAc and Petether (35:65) as eluent to afford the titled compound (120 mg) as a pale-yellow solid. M.P.: 96.5-101.2° C. 1H-NMR (δ ppm, CDCl3, 400 MHz): 7.87 (s, 1H), 7.81 (dd, J 1.7, 8, 1H), 7.80-7.75 (m, 1H), 7.67 (t, J 7.5, 1H), 7.59 (d, J 8.4, 1H), 7.50 (d, J 8.5, 1H), 4.94 (septet, J 6.2, 1H), 4.19 (d, J 10.9, 2H), 3.22-3.13 (m, 1H), 3.12 (s, 3H), 3.04 (t, J 10.9, 2H), 2.22-2.14 (m, 2H), 2.00-1.88 (m, 2H), 1.26 (d, J 6.2, 6H).

Workup

  1. customDCM removed from the reaction mixture

Sources & evidence

ORD record
ord-a5005f9caf7946a3b773d25dab64bff0
Source dataset
uspto-grants-2015_11
Patent number
US09181214B2

Reaction notes

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