Triethylamine → 1-[6-Chloro-1-(2-methoxy-ethoxymethyl)-5-(2-morpholin-4-yl-ethylamino)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl ester

HRID 408776Notes

Reaction equation

HRID 408776 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[CH:7]=[N:8][N:9]([C:11]2[N:15]([CH2:16][O:17][CH2:18][CH2:19][O:20][CH3:21])[C:14]3[CH:22]=[C:23]([Cl:27])[C:24]([NH2:26])=[CH:25][C:13]=3[N:12]=2)[CH:10]=1)=[O:5])[CH3:2].NC1C(Cl)=CC2NC(N3C=C(C(O)=O)C=N3)=NC=2C=1.O[CH:48](S([O-])(=O)=O)[CH2:49][N:50]1[CH2:55][CH2:54][O:53][CH2:52][CH2:51]1.[Na+].C(N(CC)CC)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>CCOC(C)=O.C1COCC1>[CH2:1]([O:3][C:4]([C:6]1[CH:7]=[N:8][N:9]([C:11]2[N:15]([CH2:16][O:17][CH2:18][CH2:19][O:20][CH3:21])[C:14]3[CH:22]=[C:23]([Cl:27])[C:24]([NH:26][CH2:48][CH2:49][N:50]4[CH2:55][CH2:54][O:53][CH2:52][CH2:51]4)=[CH:25][C:13]=3[N:12]=2)[CH:10]=1)=[O:5])[CH3:2]

Participants

8

Reactant 5

HCID 8471TriethylamineHCID 5049666Sodium triacetoxyborohydrideHCID 444790641-(5-Amino-6-chloro-1H-benzoimidazol-2-yl)-1H-pyrazole-4-carboxylic acidHCID 669373191-[5-Amino-6-chloro-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl esterHCID 86651252Sodium 1-hydroxy-2-morpholin-4-yl-ethanesulfonate2×

Product 1

HCID 669374151-[6-Chloro-1-(2-methoxy-ethoxymethyl)-5-(2-morpholin-4-yl-ethylamino)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl esterYield 12.5%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
23 °C

Procedure

To a slurry of 4 Å molecular sieves (0.9 g), 1-[5-amino-6-chloro-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl ester (Intermediate from Example 41, product from Step A) (0.187 g, 0.475 mmol), sodium 1-hydroxy-2-morpholin-4-yl-ethanesulfonate (0.122 g, 0.523 mmol) and THF (2.5 mL) was added triethylamine (0.300 mL, 2.15 mmol). The slurry was stirred at 23° C. for 24 h, and sodium triacetoxyborohydride (0.282 g, 1.33 mmol) was added. The reaction mixture was stirred for an additional 24 h. Additional sodium 1-hydroxy-2-morpholin-4-yl-ethanesulfonate (62.0 mg, 0.270 mmol) was added and the reaction was allowed to continue for another 24 h at 23° C. The reaction mixture was diluted with EtOAc, filtered, and washed with saturated aqueous NaHCO3. The aqueous layer was further extracted with EtOAc (2×30 mL). The combined organic layers were washed with brine, dried, filtered, and concentrated under reduced pressure. The residue was purified (FCC) (EtOAc/hexanes) to yield the titled compound (30 mg, 12% crude yield). This compound was used without further purification in subsequent reactions. MS (ESI/CI): mass calcd. for C23H31ClN6O5, 506.2; m/z found, 507.2 [M+H]+.

Workup

  1. stirringThe reaction mixture was stirred for an additional 24 h
  2. waitto continue for another 24 h at 23° C
  3. filtrationfiltered
  4. washwashed with saturated aqueous NaHCO3
  5. extractionThe aqueous layer was further extracted with EtOAc (2×30 mL)
  6. washThe combined organic layers were washed with brine
  7. customdried
  8. filtrationfiltered
  9. concentrationconcentrated under reduced pressure
  10. customThe residue was purified (FCC) (EtOAc/hexanes)

Sources & evidence

ORD record
ord-35c4406dfe074b2980468f28c5eb1802
Source dataset
uspto-grants-2014_06
Patent number
US08759345B2

Reaction notes

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