Lithium Hexamethyldisilazide → (2S)-2-[1-(3-chloropyridin-2-yl)pyrazolo[4,5-e]pyrimidin-4-yl]oxy-3-ethoxy-N-(5-methylpyrazin-2-yl)propanamide

HRID 1097991Notes

Reaction equation

HRID 1097991 reaction equation
C[Si]([N-][Si](C)(C)C)(C)C.[Li+].[CH2:11]([O:13][CH2:14][C@H:15]([OH:26])[C:16]([NH:18][C:19]1[CH:24]=[N:23][C:22]([CH3:25])=[CH:21][N:20]=1)=[O:17])[CH3:12].Cl[C:28]1[N:33]=[CH:32][N:31]=[C:30]2[N:34]([C:37]3[C:42]([Cl:43])=[CH:41][CH:40]=[CH:39][N:38]=3)[N:35]=[CH:36][C:29]=12>C1COCC1.CCOC(C)=O>[Cl:43][C:42]1[C:37]([N:34]2[C:30]3[N:31]=[CH:32][N:33]=[C:28]([O:26][C@@H:15]([CH2:14][O:13][CH2:11][CH3:12])[C:16]([NH:18][C:19]4[CH:24]=[N:23][C:22]([CH3:25])=[CH:21][N:20]=4)=[O:17])[C:29]=3[CH:36]=[N:35]2)=[N:38][CH:39]=[CH:40][CH:41]=1

Participants

6

Reactant 3

HCID 2733832Lithium HexamethyldisilazideHCID 575044824-Chloro-1-(3-chloropyridin-2-YL)-1H-pyrazolo[3,4-D]pyrimidine2×HCID 57504485(S)-3-ethoxy-2-hydroxy-N-(5-methylpyrazin-2-yl)propanamide

Product 1

HCID 57504327(2S)-2-[1-(3-chloropyridin-2-yl)pyrazolo[4,5-e]pyrimidin-4-yl]oxy-3-ethoxy-N-(5-methylpyrazin-2-yl)propanamideYield 52%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8857Ethyl AcetateSolvent

Procedure

A solution of lithium bis(trimethylsilyl)amide (1.40 mL, 1.40 mmol) was added dropwise to a stirred solution of (S)-3-ethoxy-2-hydroxy-N-(5-methylpyrazin-2-yl)propanamide (Intermediate H1) (315 mg, 1.40 mmol) in THF (15 mL) over a period of 3 minutes under nitrogen. The resulting suspension was stirred at ambient temperature for 10 minutes and then a solution of 4-chloro-1-(3-chloropyridin-2-yl)-1H-pyrazolo[3,4-d]pyrimidine (Intermediate B15) (372 mg, 1.40 mmol) in anhydrous THF (3 mL) added dropwise over 1 minute and the reaction heated to 50° C. for 3 hours. The reaction mixture was diluted with EtOAc (50 mL), and washed sequentially with water (2×25 mL) and saturated brine (25 mL). The organic layer was dried (MgSO4) and evaporated. The residue was purified by flash silica chromatography eluting with EtOAc to afford (2S)-2-[1-(3-chloropyridin-2-yl)pyrazolo[4,5-e]pyrimidin-4-yl]oxy-3-ethoxy-N-(5-methylpyrazin-2-yl)propanamide (330 mg, 52%). 1H NMR (400 MHz, CDCl3) δ 1.24 (3H, t), 2.54 (3H, s), 3.60-3.68 (2H, m), 4.07-4.16 (2H, m), 6.09 (1H, t), 7.47 (1H, dd), 8.01 (1H, dd), 8.12 (1H, d), 8.47 (1H, s), 8.62 (1H, dd), 8.64 (1H, s), 8.66 (1H, s), 9.44 (1H, d); m/z (ESI+) (M+H)+=455; HPLC tR=1.77 min.

Workup

  1. temperaturethe reaction heated to 50° C. for 3 hours
  2. washwashed sequentially with water (2×25 mL) and saturated brine (25 mL)
  3. dry with materialThe organic layer was dried (MgSO4)
  4. customevaporated
  5. customThe residue was purified by flash silica chromatography
  6. washeluting with EtOAc

Sources & evidence

ORD record
ord-13ab5d126f2c4550bc7b04957492aa4d
Source dataset
uspto-grants-2012_03
Patent number
US08143263B2

Reaction notes

Loading…