Potassium Carbonate → (S)-4-(1-Benzyl-2-hydroxy-ethylamino)-3-(4-methyl-6-phenyl-1H-benzimidazol-2-yl)-1H-pyridin-2-one

HRID 1354650Notes

Reaction equation

HRID 1354650 reaction equation
[CH2:1]([C@H:8]([NH:30][C:31]1[CH:36]=[CH:35][NH:34][C:33](=[O:37])[C:32]=1[C:38]1[NH:42][C:41]2[CH:43]=[C:44](Br)[CH:45]=[C:46]([CH3:47])[C:40]=2[N:39]=1)[CH2:9][O:10]C(C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:49]1(B(O)O)[CH:54]=[CH:53][CH:52]=[CH:51][CH:50]=1.C([O-])([O-])=O.[K+].[K+]>C1COCC1.C(Cl)Cl.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:1]([C@H:8]([NH:30][C:31]1[CH:36]=[CH:35][NH:34][C:33](=[O:37])[C:32]=1[C:38]1[NH:42][C:41]2[CH:43]=[C:44]([C:49]3[CH:54]=[CH:53][CH:52]=[CH:51][CH:50]=3)[CH:45]=[C:46]([CH3:47])[C:40]=2[N:39]=1)[CH2:9][OH:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

7

Reactant 3

HCID 11430Potassium CarbonateHCID 66827Phenylboronic AcidHCID 136365126(S)-4-(1-benzyl-2-trityloxy-ethylamino)-3-[6-bromo-4-methyl-1H-benzimidazole-2-yl]-1H-pyridin-2-one

Product 1

HCID 136118017(S)-4-(1-Benzyl-2-hydroxy-ethylamino)-3-(4-methyl-6-phenyl-1H-benzimidazol-2-yl)-1H-pyridin-2-oneYield 52.4%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a solution of (S)-4-(1-benzyl-2-trityloxy-ethylamino)-3-[6-bromo-4-methyl-1H-benzimidazole-2-yl]-1H-pyridin-2-one (50 mg, 0.072 mmol), phenylboronic acid (13 mg, 0.11 mmol), and 2 M K2CO3 (0.108 mL, 0.22 mmol) in THF (5 mL) was added Pd(PPh3)4 (8.3 mg, 0.007 mmol). The mixture was heated to reflux 14 h. Upon cooling, the reaction mixture was diluted with CH2Cl2, washed with saturated NaHCO3, dried over Na2SO4, and concentrated in vacuo. The residue was used for the next step without purification. LCMS (M+H)+ m/z 693 (t=2.82 min.). The crude product was treated with 4 N HCl dioxane solution (5 mL) at room temperature for 6 h. After concentration in vacuo, the residue was purified by prep. HPLC to yield the title compound (17 mg, 34%) as a white solid. 1H NMR (300 MHz, CD3OD) δ7.13–7.67 (13H, m), 6.15 (1H, d, J=7.4 Hz), 3.99–4.11 (1H, m), 3.74–3.77 (2H, m), 3.16 (1H, dd, J=5.4, 13.6 Hz), 2.97 (1H, dd, J=7.8, 13.6 Hz), 2.69 (3H, s). LCMS (M+H)+ m/z 451 (t=2.04 min.).

Workup

  1. temperatureThe mixture was heated
  2. temperatureto reflux 14 h
  3. temperatureUpon cooling
  4. washwashed with saturated NaHCO3
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated in vacuo
  7. customThe residue was used for the next step without purification
  8. customLCMS (M+H)+ m/z 693 (t=2.82 min.)
  9. additionThe crude product was treated with 4 N HCl dioxane solution (5 mL) at room temperature for 6 h
  10. concentrationAfter concentration in vacuo
  11. customthe residue was purified by prep

Sources & evidence

ORD record
ord-9d242f7890a440abad31fe9ceb4f4b83
Source dataset
uspto-grants-2007_05
Patent number
US07223757B2

Reaction notes

Loading…