4-Pyridinecarboxaldehyde → (1H-Benzimidazol-2-ylmethyl)-pyridin-4-ylmethyl-(5,6,7,8-tetrahydro-quinolin-8-yl)-amine

HRID 8961

Reaction equation

HRID 8961 reaction equation
C(OC([N:8]1[C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=2[N:10]=[C:9]1[CH2:17][NH:18][CH:19]1[C:28]2[N:27]=[CH:26][CH:25]=[CH:24][C:23]=2[CH2:22][CH2:21][CH2:20]1)=O)(C)(C)C.[N:29]1[CH:34]=[CH:33][C:32]([CH:35]=O)=[CH:31][CH:30]=1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(=O)(O)[O-].[Na+]>C(Cl)Cl.C(O)(C(F)(F)F)=O>[NH:8]1[C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=2[N:10]=[C:9]1[CH2:17][N:18]([CH2:35][C:32]1[CH:33]=[CH:34][N:29]=[CH:30][CH:31]=1)[CH:19]1[C:28]2[N:27]=[CH:26][CH:25]=[CH:24][C:23]=2[CH2:22][CH2:21][CH2:20]1

Participants

7

Reactant 4

HCID 133894-PyridinecarboxaldehydeHCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 219850812-[(5,6,7,8-Tetrahydroquinolin-8-ylamino)-methyl]-benzimidazole-1-carboxylic acid tert-butyl ester

Product 1

HCID 21985099(1H-Benzimidazol-2-ylmethyl)-pyridin-4-ylmethyl-(5,6,7,8-tetrahydro-quinolin-8-yl)-amineYield 70.2%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 6422Trifluoroacetic acidSolvent

Procedure

Following General Procedure B: To a solution of (1-tert-butoxycarbonyl-benzimidazol-2-ylmethyl)-(5,6,7,8-tetrahydroquinolin-8-yl)-amine (120 mg, 0.32 mmol) and 4-pyridinecarboxaldehyde (30 μL, 0.32 mmol) in CH2Cl2 (5 mL) was added sodium triacetoxyborohydride (136 mg, 0.64 mmol) and the reaction stirred for 18 h. The resulting crude material was taken up in neat TFA (1 mL) and stirred 3 h. Saturated aqueous sodium bicarbonate (5 mL) was added, and the resulting mixture was extracted with CH2Cl2 (3×10 mL) then the combined organic extracts were dried (MgSO4), and concentrated in vacuo. Purification of the crude material by radial chromatography (1 mm plate, 50:1:1 CH2Cl2—MeOH—NH4OH) afforded the title compound (83 mg, 70%) as a white solid. 1H NMR (CDCl3) δ 1.68–1.72 (m, 1H), 1.97–2.06 (m, 2H), 2.26–2.30 (m, 1H), 2.74–2.77 (m, 1H), 2.80–2.86 (m, 1H), 3.77 (s, 2H), 3.92 (d, 1H, J=16 Hz), 4.09 (dd, 1H, J=9, 7 Hz), 4.17 (d, 1H, J=16 Hz), 7.18–7.22 (m, 3H), 7.36 (d, 2H, J=6 Hz), 7.44 (dd, 1H, J=7, 1 Hz), 7.52 (br d, 1H, J=7 Hz), 7.66 (br d, 1H, J=7 Hz), 8.46 (dd, 2H, J=5, 2 Hz), 8.70 (dd, 1H, J=5, 1 Hz); 13C NMR (CDCl3) δ 21.2, 23.8, 29.0, 49.1, 53.0, 60.5, 110.9, 118.8, 121.4, 121.9, 122.5, 123.3, 133.7, 134.7, 137.4, 144.2, 146.9, 148.7, 149.8, 155.4, 156.9. ES-MS m/z 370 (M+H). Anal. Calcd. for C23H23N5.0.2H2O.0.2CH2Cl2: C, 71.44; H, 6.15; N, 17.95. Found: C, 71.63; H, 6.30; N, 17.77.

Workup

  1. stirringstirred 3 h
  2. extractionthe resulting mixture was extracted with CH2Cl2 (3×10 mL)
  3. dry with materialthe combined organic extracts were dried (MgSO4)
  4. concentrationconcentrated in vacuo
  5. customPurification of the crude material by radial chromatography (1 mm plate, 50:1:1 CH2Cl2—MeOH—NH4OH)

Sources & evidence

ORD record
ord-a73ae5db738043a19c06fc8e82d6e4e3
Source dataset
uspto-grants-2006_08
Patent number
US07091217B2

Linked notes

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