Acetyl chloride → 1-[5-Acetylamino-6-chloro-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl ester

HRID 408778Notes

Reaction equation

HRID 408778 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:39]([C:41](O)=[O:42])C=N3)=NC=2C=1.C(N(C(C)C)CC)(C)C.C(Cl)(=O)C>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][C:41](=[O:42])[CH3:39])=[CH:25][C:13]=3[N:12]=2)[CH:10]=1)=[O:5])[CH3:2]

Participants

6

Reactant 4

HCID 6367Acetyl chlorideHCID 81531DiisopropylethylamineHCID 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 ester

Product 1

HCID 669375631-[5-Acetylamino-6-chloro-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazol-2-yl]-1H-pyrazole-4-carboxylic acid ethyl esterYield 81%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred suspension of 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) (0.300 g, 0.762 mmol) and THF (4 mL) was added diisopropylethylamine (0.330 mL, 1.90 mmol) at 0° C. Acetyl chloride (57.0 μL, 0.800 mmol) was then added. After 3 h, the reaction was quenched with water (10 mL) and extracted with EtOAc (3×35 mL). The combined organic layers were washed with brine (15 mL), dried, filtered, and concentrated under reduced pressure. The residue was purified (FCC) (5-65% EtOAc/hexanes) to yield the titled compound (0.270 g, 81%) as a 2:1 mixture of regioisomers. MS (ESI/CI): mass calcd. for C19H22ClN6O6, 435.1; m/z found, 436.1 [M+H]+. 1H NMR (400 MHz, CDCl3): 8.83 (s, 1H), 8.71 (s, 1H), 8.18 (s, 1H), 7.79 (br s, 1H), 7.74 (s, 1H), 6.10 (s, 1H), 4.36 (q, J=7.1 Hz, 2H), 3.66-3.62 (m, 2H), 3.48-3.43 (m, 2H), 3.29 (s, 3H), 2.29 (s, 3H), 1.38 (t, J=7.1 Hz, 3H).

Workup

  1. customthe reaction was quenched with water (10 mL)
  2. extractionextracted with EtOAc (3×35 mL)
  3. washThe combined organic layers were washed with brine (15 mL)
  4. customdried
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was purified (FCC) (5-65% EtOAc/hexanes)

Sources & evidence

ORD record
ord-da32510028e24bd3821974f910b2f593
Source dataset
uspto-grants-2014_06
Patent number
US08759345B2

Reaction notes

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