Trifluoroacetic acid → (3S)-3-amino-1-[6-[6-(6-methylpyrazin-2-yl)pyrazolo[4,3-c]pyridin-1-yl]-2-pyridyl]piperidin-2-one

HRID 57934Notes

Reaction equation

HRID 57934 reaction equation
[CH3:1][C:2]1[N:7]=[C:6]([C:8]2[N:13]=[CH:12][C:11]3[CH:14]=[N:15][N:16]([C:17]4[N:22]=[C:21]([N:23]5[CH2:28][CH2:27][CH2:26][C@H:25]([NH:29]C(=O)OC(C)(C)C)[C:24]5=[O:37])[CH:20]=[CH:19][CH:18]=4)[C:10]=3[CH:9]=2)[CH:5]=[N:4][CH:3]=1.FC(F)(F)C(O)=O>ClCCl>[NH2:29][C@H:25]1[CH2:26][CH2:27][CH2:28][N:23]([C:21]2[CH:20]=[CH:19][CH:18]=[C:17]([N:16]3[C:10]4[CH:9]=[C:8]([C:6]5[CH:5]=[N:4][CH:3]=[C:2]([CH3:1])[N:7]=5)[N:13]=[CH:12][C:11]=4[CH:14]=[N:15]3)[N:22]=2)[C:24]1=[O:37]

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 86707119tert-butyl N-[(3S)-1-[6-[6-(6-methylpyrazin-2-yl)pyrazolo[4,3-c]pyridin-1-yl]-2-pyridyl]-2-oxo-3-piperidyl]carbamate

Product 1

HCID 72714481(3S)-3-amino-1-[6-[6-(6-methylpyrazin-2-yl)pyrazolo[4,3-c]pyridin-1-yl]-2-pyridyl]piperidin-2-oneYield 39.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A solution of tert-butyl N-[(3S)-1-[6-[6-(6-methylpyrazin-2-yl)pyrazolo[4,3-c]pyridin-1-yl]-2-pyridyl]-2-oxo-3-piperidyl]carbamate (140 mg, 0.280 mmol) in dichloromethane 4.0 ml and trifluoroacetic acid (0.80 ml, 10 mmol) was stirred at RT 3 h. The reaction was concentrated and diluted with water then extracted with EtOAc. The aqueous layer was basified with 1M NaOH to pH 10 then extracted with EtOAc. The organic layers was dried with sodium sulfate, filtered, and concentrated in vacuum. The crude product was submitted for reverse phase HPLC to give 225 (44 mg, 39% yield). MS (ESI) m/z: 401.1. 1H NMR (400 MHz, DMSO) δ 9.60 (s, 1H), 9.47 (s, 1H), 9.33 (s, 1H), 8.72 (s, 1H), 8.64 (s, 1H), 8.05 (t, J=8.1 Hz, 1H), 7.82 (d, J=8.0 Hz, 1H), 7.74 (d, J=8.1 Hz, 1H), 4.46-4.33 (m, 1H), 4.14-4.02 (m, 1H), 3.58 (dd, J=10.8, 6.4 Hz, 1H), 2.65 (s, 3H), 2.24 (dt, J=11.4, 5.3 Hz, 1H), 2.19-2.00 (m, 2H), 1.77 (ddd, J=23.0, 10.6, 5.1 Hz, 1H).

Workup

  1. concentrationThe reaction was concentrated
  2. additiondiluted with water
  3. extractionthen extracted with EtOAc
  4. extractionthen extracted with EtOAc
  5. dry with materialThe organic layers was dried with sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuum

Sources & evidence

ORD record
ord-faccf07d6c8a40169f83e72ba6a327c5
Source dataset
uspto-grants-2016_09
Patent number
US09434725B2

Reaction notes

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