1-Chloro-4-methylphthalazine → 5-Amino-1-phenylbenzimidazole

HRID 1471339Notes

Reaction equation

HRID 1471339 reaction equation
ClC1C2C(=CC=CC=2)C(C)=NN=1.[NH2:13][C:14]1[CH:34]=[CH:33][C:17]2[N:18]([C:21]3[CH:26]=[CH:25][C:24](C4C=CC=CC=4)=[CH:23][CH:22]=3)[CH:19]=[N:20][C:16]=2[CH:15]=1>CC(O)C>[NH2:13][C:14]1[CH:34]=[CH:33][C:17]2[N:18]([C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)[CH:19]=[N:20][C:16]=2[CH:15]=1

Participants

4

Reactant 2

HCID 2697331-Chloro-4-methylphthalazineHCID 13024894HCID 13024894, compound

Product 1

HCID 9653125-Amino-1-phenylbenzimidazoleYield 181.6%

Reagents, catalysts & solvents 1

HCID 3776IsopropanolSolvent

Procedure

A solution of 1-chloro-4-methylphthalazine (25 mg, 0.14 mmol) and 5-amino-1-(biphen-4-yl)benzimidazole (3) (28.5 mg, 0.10 mmol) in i-PrOH (2 mL) is stirred at 95° C. under argon for 2.5 h, cooled to room temperature, and concentrated at reduced pressure. The residue is diluted with sat. NaHCO3 (15 mL) and extracted with CHCl3 (60 mL). The extract is washed (brine) and dried. After solvent removal at reduced pressure, the residue is purified on silica gel (3.2% to 4.8% methanol/ethyl acetate) to give 38 mg (88%) of 4 (BI-3039) as a light-brown solid, mp 272-274° C. IR 3339, 2979, 1522, 1412 cm−1; 1H NMR (CD3OD/CDCl3) δ 2.82 (s, 3H, CH3), 7.36-7.53 (m, 3H, PhH), 7.62 (d, J=9.00 Hz, 1H, 7-BenzimidH), 7.69 (m, 2H, Aril, 2H PhH), 7.79 (d, J=8.7 Hz, 1H, 6-BenzimidH), 7.86 (d, J=8.1 Hz, 2H, ArH), 7.91-7.98 (m, 2H, 6,7-PhthH), 8.07 (m, 1H, 5-PhthH), 8.10 (s, 1H, 4-BenzimidH), 8.32 (s, 1H, 2-BenzimidH), 8.45 ppm (m, 1H, 8-PhthH).

Workup

  1. concentrationconcentrated at reduced pressure
  2. additionThe residue is diluted with sat. NaHCO3 (15 mL)
  3. extractionextracted with CHCl3 (60 mL)
  4. washThe extract is washed (brine)
  5. customdried
  6. customAfter solvent removal at reduced pressure
  7. customthe residue is purified on silica gel (3.2% to 4.8% methanol/ethyl acetate)

Sources & evidence

ORD record
ord-a243f4a8db75461eba0da2f8152b8a0e
Source dataset
uspto-grants-2015_04
Patent number
US09012217B2

Reaction notes

Loading…