Trifluoroacetic acid → 6-(5-((S)-2-amino-3-(4(trifluoromethyl)phenyl)propylamino)-1,3,4-thiadiazol-2-yl)benzo[d]oxazol-2(3H)-one

HRID 2075340Notes

Reaction equation

HRID 2075340 reaction equation
[O:1]=[C:2]1[NH:6][C:5]2[CH:7]=[CH:8][C:9]([C:11]3[S:15][C:14]([N:16](C(OC(C)(C)C)=O)[CH2:17][C@@H:18]([NH:30]C(=O)OC(C)(C)C)[CH2:19][C:20]4[CH:25]=[CH:24][C:23]([C:26]([F:29])([F:28])[F:27])=[CH:22][CH:21]=4)=[N:13][N:12]=3)=[CH:10][C:4]=2[O:3]1.C(O)(C(F)(F)F)=O>C(Cl)Cl>[NH2:30][C@@H:18]([CH2:19][C:20]1[CH:25]=[CH:24][C:23]([C:26]([F:27])([F:28])[F:29])=[CH:22][CH:21]=1)[CH2:17][NH:16][C:14]1[S:15][C:11]([C:9]2[CH:8]=[CH:7][C:5]3[NH:6][C:2](=[O:1])[O:3][C:4]=3[CH:10]=2)=[N:12][N:13]=1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 57991881tert-Butyl (S)-1-(5-(2-oxo-2,3-dihydrobenzo[d]oxazol-6-yl)-1,3,4-thiadiazol-2-yl-boc-amino)-3-(4-(trifluoromethyl)phenyl)propan-2-ylcarbamate

Product 1

HCID 579918766-(5-((S)-2-amino-3-(4(trifluoromethyl)phenyl)propylamino)-1,3,4-thiadiazol-2-yl)benzo[d]oxazol-2(3H)-oneYield 53%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

tert-Butyl (S)-1-(5-(2-oxo-2,3-dihydrobenzo[d]oxazol-6-yl)-1,3,4-thiadiazol-2-yl-boc-amino)-3-(4-(trifluoromethyl)phenyl)propan-2-ylcarbamate (130 mg, 205 μmol) in 10 mL DCM was treated with 10 mL TFA for 60 minutes. After removing the solvent, the remaining residue was dissolved in 100 mL EtOAc. The resulting solution was washed with a mixture of aqueous saturated sodium bicarbonate plus 5% 5N NaOH, then twice with saturated sodium bicarbonate. The organic layer was dried over sodium sulfate. Removal of the solvent gave the title compound 6-(5-((S)-2-amino-3-(4(trifluoromethyl)phenyl)propylamino)-1,3,4-thiadiazol-2-yl)benzo[d]oxazol-2(3H)-one as an off-white amorphous solid (47 mgs, 53%). LCMS (API-ES) m/z (%): 436.0 (100%, M++H); 1H NMR (400 MHz, CD3OD) δ ppm 2.78 (dd, J=13.60, 7.53 Hz, 1H) 2.99 (dd, J=13.60, 5.58 Hz, 1H) 3.35-3.40 (m, 1H) 3.40-3.47 (m, 1H) 3.48-3.55 (m, 1H) 7.13 (d, J=8.22 Hz, 1H) 7.48 (d, J=8.02 Hz, 2H) 7.53 (dd, J=8.12, 1.47 Hz, 1H) 7.62 (d, J=7.24 Hz, 3H).

Workup

  1. customAfter removing the solvent
  2. dissolutionthe remaining residue was dissolved in 100 mL EtOAc
  3. washThe resulting solution was washed with a mixture of aqueous saturated sodium bicarbonate plus 5% 5N NaOH
  4. dry with materialThe organic layer was dried over sodium sulfate
  5. customRemoval of the solvent

Sources & evidence

ORD record
ord-c814139a932742238042a6288f4db035
Source dataset
uspto-grants-2011_04
Patent number
US07919504B2

Reaction notes

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