Formaldehyde → HCID 67371250, compound

HRID 402021Notes

Reaction equation

HRID 402021 reaction equation
[ClH:1].Cl.[CH2:3]([C:7]1[N:8]=[N:9][C:10]([O:32][CH:33]2[CH2:38][CH2:37][NH:36][CH2:35][CH2:34]2)=[CH:11][C:12]=1[C:13]1[CH:18]=[CH:17][C:16]([O:19][CH:20]2[CH2:25][CH2:24][CH2:23][CH2:22][CH2:21]2)=[C:15]([C:26]2[N:30]([CH3:31])[N:29]=[N:28][N:27]=2)[CH:14]=1)[CH2:4][CH2:5][CH3:6].C=O.O.[C:42](O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(Cl)Cl.C(O)(=O)C>[ClH:1].[ClH:1].[CH2:3]([C:7]1[N:8]=[N:9][C:10]([O:32][CH:33]2[CH2:38][CH2:37][N:36]([CH3:42])[CH2:35][CH2:34]2)=[CH:11][C:12]=1[C:13]1[CH:18]=[CH:17][C:16]([O:19][CH:20]2[CH2:21][CH2:22][CH2:23][CH2:24][CH2:25]2)=[C:15]([C:26]2[N:30]([CH3:31])[N:29]=[N:28][N:27]=2)[CH:14]=1)[CH2:4][CH2:5][CH3:6]

Participants

7

Reactant 4

HCID 712FormaldehydeHCID 962WaterHCID 5049666Sodium triacetoxyborohydrideHCID 67375356HCID 67375356, compound

Product 1

HCID 67371250HCID 67371250, compoundYield 171.7%

Reagents, catalysts & solvents 2

HCID 176Acetic AcidCatalystHCID 6344DichloromethaneSolvent

Procedure

To a solution of 3-butyl-4-[4-cyclohexyloxy-3-(1-methyl-1H-tetrazol-5-yl)-phenyl]-6-(piperidin-4-yloxy)-pyridazine dihydrochloride (0.379 mmol, 214 mg) in DCM (2 mL) was added formaldehyde solution in water (37%, 1.14 mmol, 0.085 mL) and 2 drops of acetic acid. Sodium triacetoxyborohydride (1.52 mmol, 339 mg, 95%) was added. The reaction mixture was stirred at room temperature for 1 h and partitioned between ethyl acetate (20 mL) and saturated aq. sodium bicarbonate solution (20 mL). The ethyl acetate layer was separated and dried over sodium sulfate. The crude product was purified by column chromatography on silica gel using 2 M ammonia in MeOH/DCM 1:19 to 1:14, dissolved in MeOH and treated with 4 N HCl in dioxane. The organic solvents were removed in vacuo and the residue was triturated with anhydrous diethyl ether. The yellow solid was dried overnight under high vacuum to provide the title compound (188.2 mg). LCMS: m/z 507 [M+1] 1H NMR (400 MHz, CD3OD) δ 7.85 and 7.93 (1H, s), 7.79-7.85 (1H, m), 7.69 (1H, dd), 7.49-7.53 (1H, m), 5.38-5.56 (1H, m), 4.64-4.69 (1H, m), 4.05 and 4.06 (3H, s), 3.13-3.69 (6H, m), 2.94 (3H, s), 1.97-2.54 (12H, m), 1.30-1.63 (6H, m), 0.84 (3H, dt).

Workup

  1. custompartitioned between ethyl acetate (20 mL) and saturated aq. sodium bicarbonate solution (20 mL)
  2. customThe ethyl acetate layer was separated
  3. dry with materialdried over sodium sulfate
  4. customThe crude product was purified by column chromatography on silica gel using 2 M ammonia in MeOH/DCM 1:19 to 1:14
  5. dissolutiondissolved in MeOH
  6. additiontreated with 4 N HCl in dioxane
  7. customThe organic solvents were removed in vacuo
  8. customthe residue was triturated with anhydrous diethyl ether
  9. customThe yellow solid was dried overnight under high vacuum

Sources & evidence

ORD record
ord-3abef34d8375455f8c16eb1a4f500fa4
Source dataset
uspto-grants-2014_06
Patent number
US08741900B2

Reaction notes

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