Cyclohexanone → (R)-6-(1-cyclohexyl-1,2,3,6-tetrahydropyridin-4-yl)-1-(1-(2,4-dichlorophenyl)ethyl)-1H-benzo[d]imidazole

HRID 2359121Notes

Reaction equation

HRID 2359121 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C@H:9]([N:11]1[C:15]2[CH:16]=[C:17]([C:20]3[CH2:21][CH2:22][NH:23][CH2:24][CH:25]=3)[CH:18]=[CH:19][C:14]=2[N:13]=[CH:12]1)[CH3:10].[C:26]1(=O)[CH2:31][CH2:30][CH2:29][CH2:28][CH2:27]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCl.C(O)(=O)C>[CH:26]1([N:23]2[CH2:22][CH:21]=[C:20]([C:17]3[CH:18]=[CH:19][C:14]4[N:13]=[CH:12][N:11]([C@@H:9]([C:3]5[CH:4]=[CH:5][C:6]([Cl:8])=[CH:7][C:2]=5[Cl:1])[CH3:10])[C:15]=4[CH:16]=3)[CH2:25][CH2:24]2)[CH2:31][CH2:30][CH2:29][CH2:28][CH2:27]1

Participants

6

Reactant 3

HCID 7967CyclohexanoneHCID 5049666Sodium triacetoxyborohydrideHCID 86688430(R)-1-(1-(2,4-dichlorophenyl)ethyl)-6-(1,2,3,6-tetrahydropyridin-4-yl)-1H-benzo[d]imidazole

Product 1

HCID 71581877(R)-6-(1-cyclohexyl-1,2,3,6-tetrahydropyridin-4-yl)-1-(1-(2,4-dichlorophenyl)ethyl)-1H-benzo[d]imidazoleYield 25%

Reagents, catalysts & solvents 2

HCID 176Acetic AcidCatalystHCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of the crude (R)-1-(1-(2,4-dichlorophenyl)ethyl)-6-(1,2,3,6-tetrahydropyridin-4-yl)-1H-benzo[d]imidazole (prepared from Example 4 step d, 0.047 g, 0.13 mmol) and cyclohexanone (0.0.038 g, 0.38 mmol) in dichloromethane (1 mL) was added sodium triacetoxyborohydride (NaBH(OAc)3, 0.11 g, 0.52 mmol) and acetic acid (3 drops). The reaction mixture was stirred at room temperature for 18 h, and quenched with saturated aqueous sodium bicarbonate. The mixture was extracted with dichloromethane (2×15 mL). The combined organic layers were dried (Na2SO4), filtered, and concentrated in vacuo. The resulting crude material was purified by reverse phase HPLC (C18 column, acetonitrile-H2O with 0.1% TFA as eluent) to give a white solid (0.015 g, 0.032 mmol, 25%). 1H NMR (400 MHz, CDCl3) δ 8.09 (s, 1 H), 7.69 (d, J=8.4 Hz, 1 H), 7.44 (d, J=2.4 Hz, 1 H), 7.32 (dd, J=1.2, 8.4 Hz, 1 H), 7.12 (dd, J=2.4, 8.4 Hz, 1 H), 7.06 (s, 1 H), 6.82 (d, J=8.4 Hz, 1 H), 5.99-5.94 (m, 2 H), 3.30 (d, J=2.8 Hz, 2 H), 2.81-2.78 (m, 2 H), 2.58-2.48 (m, 2 H), 2.38-2.36 (m, 1 H), 1.97 (d, J=6.8 Hz, 3 H), 1.94-1.82 (m, 4 H), 1.67-1.64 (m, 1 H), 1.31-1.26 (m, 4 H), 1.15-1.11 (m, 1 H); MS: (ES) m/z calculated for C26H30Cl2N3 [M+H]+ 454.2, found 453.

Workup

  1. customquenched with saturated aqueous sodium bicarbonate
  2. extractionThe mixture was extracted with dichloromethane (2×15 mL)
  3. dry with materialThe combined organic layers were dried (Na2SO4)
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. customThe resulting crude material was purified by reverse phase HPLC (C18 column, acetonitrile-H2O with 0.1% TFA as eluent)

Sources & evidence

ORD record
ord-fdcb6a52e4604f70afbda6c1bce00027
Source dataset
uspto-grants-2014_04
Patent number
US08685959B2

Reaction notes

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