Dichloromethane → Trifluoroacetic acid

HRID 1096618Notes

Reaction equation

HRID 1096618 reaction equation
[CH3:1][O:2][C:3]1[N:8]=[C:7]2[N:9]([CH2:41][CH2:42][CH2:43][O:44][CH3:45])[C:10]([CH:12]3[CH2:17][CH2:16][CH2:15][N:14]([C:18](=[O:40])[CH2:19][C@H:20]([NH:32]C(=O)OC(C)(C)C)[CH2:21][C:22]4[CH:31]=[CH:30][C:29]5[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=5)[CH:23]=4)[CH2:13]3)=[N:11][C:6]2=[CH:5][CH:4]=1.ClCCl.[F:49][C:50]([F:55])([F:54])[C:51]([OH:53])=[O:52]>CO.CC#N.O>[NH2:32][C@H:20]([CH2:21][C:22]1[CH:31]=[CH:30][C:29]2[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=2)[CH:23]=1)[CH2:19][C:18]([N:14]1[CH2:15][CH2:16][CH2:17][CH:12]([C:10]2[N:9]([CH2:41][CH2:42][CH2:43][O:44][CH3:45])[C:7]3=[N:8][C:3]([O:2][CH3:1])=[CH:4][CH:5]=[C:6]3[N:11]=2)[CH2:13]1)=[O:40].[F:49][C:50]([F:55])([F:54])[C:51]([OH:53])=[O:52]

Participants

8

Reactant 3

HCID 6344DichloromethaneHCID 6422Trifluoroacetic acidHCID 66785172(R)-tert-butyl 4-(3-(5-methoxy-3-(3-methoxypropyl)-3H-imidazo[4,5-b]pyridin-2-yl)piperidin-1-yl)-1-(naphthalen-2-yl)-4-oxobutan-2-ylcarbamate

Product 2

HCID 6422Trifluoroacetic acidHCID 66785716(R)-3-amino-1-(3-(5-methoxy-3-(3-methoxypropyl)-3H-imidazo[4,5-b]pyridin-2-yl)piperidin-1-yl)-4-(naphthalen-2-yl)butan-1-one

Reagents, catalysts & solvents 3

HCID 887MethanolSolventHCID 962WaterSolventHCID 6342AcetonitrileSolvent

Procedure

(R)-tert-Butyl 4-(3-(5-methoxy-3-(3-methoxypropyl)-3H-imidazo[4,5-b]pyridin-2-yl)piperidin-1-yl)-1-(naphthalen-2-yl)-4-oxobutan-2-ylcarbamate (33E) (0.069 mmol, 0.042 g) was added to a 10 mL round-bottomed flask equipped for stirring under nitrogen. Dichloromethane (1 mL) and trifluoroacetic acid (1 mL) were then added and the resultant solution was allowed to stir under nitrogen for 4 hr. The solvent was removed in-vacuo affording a clear colored oil. This oil was re-dissolved in methanol (3 mL), filtered, and then purified by preparative LC/MS (5-55% CH3CN in H2O). The resultant fractions were collected and the solvent was removed in-vacuo affording a clear colored oil. This oil was re-dissolved in CH3CN (1 mL) and water (2 mL). The resultant solution was frozen and lyophilized to afford (R)-3-amino-1-(3-(5-methoxy-3-(3-methoxypropyl)-3H-imidazo[4,5-b]pyridin-2-yl)piperidin-1-yl)-4-(naphthalen-2-yl)butan-1-one (100) as its trifluoroacetic acid salt and as a white flocculent solid (0.067 mmol, 0.035 g, 98% yield) 1H NMR (400 MHz, DMSO-d6) δ ppm 1.37-1.58 (m, 1 H) 1.68-2.14 (m, 5H) 2.57-2.89 (m, 2H) 2.89-3.23 (m, 8H) 3.24-3.48 (m, 2H) 3.92 (d, J=2.53 Hz, 5H) 4.02-4.35 (m, 2H) 4.36-4.62 (m, 1H) 6.63-6.76 (m, 1 FI) 7.35-7.59 (m, 3 H) 7.72-8.02 (m, 5H). ESI-MS: m/z 516.2 (M+H)+.

Workup

  1. customequipped
  2. stirringto stir under nitrogen for 4 hr
  3. customThe solvent was removed in-vacuo
  4. customaffording a clear colored oil
  5. filtrationfiltered
  6. custompurified by preparative LC/MS (5-55% CH3CN in H2O)
  7. customThe resultant fractions were collected
  8. customthe solvent was removed in-vacuo
  9. customaffording a clear colored oil

Sources & evidence

ORD record
ord-99a2bdc6df254a469f42f5c4e4398c8a
Source dataset
uspto-grants-2012_03
Patent number
US08138168B1

Reaction notes

Loading…