Hydrazine hydrate (1:1) → HCID 178506258, compound

HRID 44532Notes

Reaction equation

HRID 44532 reaction equation
[Cl:1][C:2]1[C:7]([Cl:8])=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:9][N:10]1[C:14]2[CH:15]=[C:16]([N:22]3[CH2:27][CH2:26][O:25][CH2:24][CH2:23]3)[CH:17]=[C:18]([C:19]([NH2:21])=O)[C:13]=2[N:12]=[C:11]1[C:28]([F:31])([F:30])[F:29].COC(OC)[N:35]([CH3:37])C.O.[NH2:41]N>>[Cl:1][C:2]1[C:7]([Cl:8])=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:9][N:10]1[C:14]2[CH:15]=[C:16]([N:22]3[CH2:23][CH2:24][O:25][CH2:26][CH2:27]3)[CH:17]=[C:18]([C:19]3[N:21]=[CH:37][NH:35][N:41]=3)[C:13]=2[N:12]=[C:11]1[C:28]([F:29])([F:30])[F:31]

Participants

4

Reactant 3

HCID 24654Hydrazine hydrate (1:1)HCID 78373Dimethylformamide dimethyl acetalHCID 669767431-[(2,3-dichlorophenyl)methyl]-6-(4-morpholinyl)-2-(trifluoromethyl)-1H-benzimidazole-4-carboxamide

Product 1

HCID 178506258HCID 178506258, compoundYield 27.6%

Conditions

Temperature
105 °C

Procedure

A suspension of 1-[(2,3-dichlorophenyl)methyl]-6-(4-morpholinyl)-2-(trifluoromethyl)-1H-benzimidazole-4-carboxamide, prepared as described in Example 56, step a (389 mg, 0.822 mmol) in N,N-dimethylformamide dimethyl acetal (9 mL, 67.2 mmol) was stirred at 105° C. for 1 hour. The reaction was concentrated under reduced pressure and the residue was suspended in Acetic Acid (7 mL). After the addition of hydrazine monohydrate (0.181 mL, 5.75 mmol) the reaction mixture was heated at 100° C. for 1 hour. The solvent was concentrated under vacuum and the residue was dissolved in DMSO and purified by reverse phase-HPLC (20-95% AcCN in water plus 0.1% TFA) (some residual solid filtered off). The fractions containing product were combined, neutralized by the addition of aq NaHCO3 sat sol and the organic evaporated (some compound lost during transfer). The precipitate in the aqueous residue was collected by filtration, washed with water and dried in a vacuum oven (45° C.) overnight to give the desired product (115 mg, 0.227 mmol, 27.6% yield) as a white powder. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 13.05 (br. s., 1H), 8.12 (s, 1H), 8.00 (d, J=2.27 Hz, 1H), 7.47 (dd, J=8.08, 1.26 Hz, 1H), 7.10 (t, J=7.96 Hz, 1H), 6.59 (d, J=2.27 Hz, 1H), 6.37 (dd, J=7.83, 1.01 Hz, 1H), 5.62 (s, 2H), 3.79-3.92 (m, 4H), 3.17-3.30 (m, 4H). MS (ES+) m/e 497 [M+H]+.

Workup

  1. customprepared
  2. concentrationThe reaction was concentrated under reduced pressure
  3. temperaturewas heated at 100° C. for 1 hour
  4. concentrationThe solvent was concentrated under vacuum
  5. dissolutionthe residue was dissolved in DMSO
  6. custompurified by reverse phase-HPLC (20-95% AcCN in water plus 0.1% TFA) (some residual solid
  7. filtrationfiltered off)
  8. additionThe fractions containing product
  9. additionneutralized by the addition of aq NaHCO3
  10. customthe organic evaporated (some compound
  11. filtrationThe precipitate in the aqueous residue was collected by filtration
  12. washwashed with water
  13. customdried in a vacuum oven (45° C.) overnight

Sources & evidence

ORD record
ord-ad4bde9559e34475b193ca7f4851d181
Source dataset
uspto-grants-2013_09
Patent number
US08541411B2

Reaction notes

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