Trifluoroacetic acid → (2S,4R)-4-[4-[6-amino-5-(1,3-benzoxazol-2-yl)-3-pyridyl]pyrazol-1-yl]-N-methyl-pyrrolidine-2-carboxamide

HRID 908461Notes

Reaction equation

HRID 908461 reaction equation
FC(F)(F)C(O)=O.[NH2:8][C:9]1[N:14]=[CH:13][C:12]([C:15]2[CH:16]=[N:17][N:18]([C@H:20]3[CH2:24][N:23](C(OC(C)(C)C)=O)[C@H:22]([C:32](=[O:35])[NH:33][CH3:34])[CH2:21]3)[CH:19]=2)=[CH:11][C:10]=1[C:36]1[O:37][C:38]2[CH:44]=[CH:43][CH:42]=[CH:41][C:39]=2[N:40]=1>>[NH2:8][C:9]1[N:14]=[CH:13][C:12]([C:15]2[CH:16]=[N:17][N:18]([C@H:20]3[CH2:24][NH:23][C@H:22]([C:32]([NH:33][CH3:34])=[O:35])[CH2:21]3)[CH:19]=2)=[CH:11][C:10]=1[C:36]1[O:37][C:38]2[CH:44]=[CH:43][CH:42]=[CH:41][C:39]=2[N:40]=1

Participants

3

Reactant 2

HCID 6422Trifluoroacetic acidHCID 67388909(2S,4R)-tert-butyl 4-[4-[6-amino-5-(1,3-benzoxazol-2-yl)-3-pyridyl]pyrazol-1-yl]-2-(methylcarbamoyl)pyrrolidine-1-carboxylate

Product 1

HCID 57687107(2S,4R)-4-[4-[6-amino-5-(1,3-benzoxazol-2-yl)-3-pyridyl]pyrazol-1-yl]-N-methyl-pyrrolidine-2-carboxamideYield 98.1%

Conditions

Temperature
25 °C

Procedure

Trifluoroacetic acid (5 ml) was added to (2S,4R)-tert-butyl 4-[4-[6-amino-5-(1,3-benzoxazol-2-yl)-3-pyridyl]pyrazol-1-yl]-2-(methylcarbamoyl)pyrrolidine-1-carboxylate (70 mg) under argon. The resulting solution was stirred at 25° C. for 1 hour. The solution was evaporated under reduced pressure. The residue was basified with a solution of ammonia in methanol and the resultant mixture was adsorbed onto silica gel and purified by flash chromatography on silica gel eluting with 1 to 6% methanolic ammonia (7 N) in dichloromethane. The solvent was evaporated to dryness to afford (2S,4R)-4-[4-[6-amino-5-(1,3-benzoxazol-2-yl)-3-pyridyl]pyrazol-1-yl]-N-methyl-pyrrolidine-2-carboxamide (55 mg) as a solid. NMR Spectrum: (CDCl3) 1.75 (bs, 1H), 2.48-2.58 (m, 1H), 2.68-2.76 (m, 1H), 2.85 (d, 1.5H), 2.87 (d, 1.5H), 3.08 (d, 0.5H), 3.10 (d, 0.5H), 3.43-3.46 (m, 0.5H), 3.46-3.49 (m, 0.5H), 4.11-4.17 (m, 1H), 4.79-4.85 (m, 1H), 6.95 (m, 2H), 7.34-7.42 (m, 2H), 7.58-7.62 (m, 1H), 7.63-7.68 (m, 1H), 7.69 (s, 1H), 7.73-7.78 (m, 2H), 8.36 (d, 1H), 8.38 (d, 1H); Mass spectrum: M+H+ 404.

Workup

  1. customThe solution was evaporated under reduced pressure
  2. custompurified by flash chromatography on silica gel eluting with 1 to 6% methanolic ammonia (7 N) in dichloromethane
  3. customThe solvent was evaporated to dryness

Sources & evidence

ORD record
ord-d3a8139aa4c44d3a84e8b147e405e89b
Source dataset
uspto-grants-2011_09
Patent number
US08017611B2

Reaction notes

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