Trifluoroacetic acid → 5-[3-fluoro-4-(1H-tetrazol-1-yl)phenyl]-2-(piperidin-4-yl)benzo[d]oxazole 2,2,2-trifluoroacetate

HRID 710133Notes

Reaction equation

HRID 710133 reaction equation
[F:1][C:2]1[CH:3]=[C:4]([C:13]2[CH:14]=[CH:15][C:16]3[O:20][C:19]([CH:21]4[CH2:26][CH2:25][N:24](C(OC(C)(C)C)=O)[CH2:23][CH2:22]4)=[N:18][C:17]=3[CH:34]=2)[CH:5]=[CH:6][C:7]=1[N:8]1[CH:12]=[N:11][N:10]=[N:9]1.[F:35][C:36]([F:41])([F:40])[C:37]([OH:39])=[O:38]>C(Cl)Cl>[F:35][C:36]([F:41])([F:40])[C:37]([OH:39])=[O:38].[F:1][C:2]1[CH:3]=[C:4]([C:13]2[CH:14]=[CH:15][C:16]3[O:20][C:19]([CH:21]4[CH2:22][CH2:23][NH:24][CH2:25][CH2:26]4)=[N:18][C:17]=3[CH:34]=2)[CH:5]=[CH:6][C:7]=1[N:8]1[CH:12]=[N:11][N:10]=[N:9]1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 71114205Tert-butyl 4-{5-[3-fluoro-4-(1H-tetrazol-1-yl)phenyl]benzo[d]oxazol-2-yl}piperidine-1-carboxylate

Product 1

HCID 712575575-[3-fluoro-4-(1H-tetrazol-1-yl)phenyl]-2-(piperidin-4-yl)benzo[d]oxazole 2,2,2-trifluoroacetate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Tert-butyl 4-{5-[3-fluoro-4-(1H-tetrazol-1-yl)phenyl]benzo[d]oxazol-2-yl}piperidine-1-carboxylate (120 mg, 0.26 mmol) dissolved in DCM (15 ml) and added Trifluoroacetic acid (0.5 ml). This mixture was stirred at rt for 2 h. DCM removed from the reaction mixture to obtain 5-[3-fluoro-4-(1H-tetrazol-1-yl)phenyl]-2-(piperidin-4-yl)benzo[d]oxazole 2,2,2-trifluoroacetate (120 mg). 5-[3-fluoro-4-(1H-tetrazol-1-yl)phenyl]-2-(piperidin-4-yl)benzo[d]oxazole 2,2,2-trifluoroacetate (120 mg, 0.25 mmol) was dissolved in DCM (15 ml) and added TEA (0.27 ml, 2 mmol). This mixture stirred at rt for 30 mins and added isopropyl chloroformate in toluene (61 mg, 0.34 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 (20 mg) as an off-white solid. M.P.: 187-191° C. 1H-NMR (δ ppm, CDCl3, 400 MHz): 9.14 (d, J 2.6, 1H), 8.02 (t, J 8.2, 1H), 7.90 (d, J 1.4, 1H), 7.63-7.55 (m, 4H), 4.95 (septet, J 6.2, 1H), 4.20 (d, J 11.2, 2H), 3.22-3.14 (m, 1H), 3.04 (t, J 11.4, 2H), 2.18 (d, J 10.8, 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-8871f7580b1747359401c1710565323f
Source dataset
uspto-grants-2015_11
Patent number
US09181214B2

Reaction notes

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