4-METHYL-1H-BENZOIMIDAZOLE

N'-(3, 4-Dimethoxybenzylidene)-3-(4-methyl-lH-benzo[d]imidazol-l- yl)propanehydrazide; [0523] (a) 4-Methyl-lH-benzo[d]imidazole: 3-Methylbenzene-l, 2-diamine(400 mg, 3.27 mmol), triethylorthoformate (0.65 mL, 3.92 mmol) and IGeneral procedure: A 16 mL vial with a PTFE/silicone septum and a nitrogen-bubbler line was charged with N-benzylbenzimidazole (208.1 mg, 1.0 mmol), Pd/C (10 wt percent, dry powder, reduced) (20 mg) and THF (5 mL). The mixture was treated at rt with triethylsilane (320 µL, 2.0 mmol) and then stirred under nitrogen for 14 h at rt. The mixture was filtered through a 0.45 µM PTFE syringe filter and the filtrate was concentrated in vacuo. The residue was purified by column chromatography (0 to 10percent MeOH/ dichloromethane) to afford benzimidazole as a colorless solid (117.6 mg, 0.996 mmol 99percent). The reactions generally exhibit an induction period of 5 to 30 min as indicated by the initiation of gas release (i.e., bubbling) from the reaction mixture. The use of Pd/C on a dry matrix is imperative as wet Pd/C results in decreased yield or no reaction.General procedure: TUD (20 mmol) was added in batches to a solution of substituted 2‑nitroanilines (5 mmol) and NaOH (20 mmol) in H2O (15 mL) and EtOH (5 mL) at 70 °C. The reaction mixture was stirred for a certain period of time as required to complete the reaction (monitored byTLC). After cooling, 10percent NaOH solutions were added until pH = 9–10, the precipitated solid was filtered off and washed with water to obtain crude product. The crude product was recrystallised from water to give a white solid. The physical and spectra data of the compounds 2a–h were as follows.General procedure: A 16 mL vial with a PTFE/silicone septum and a nitrogen-bubbler line was charged with N-benzylbenzimidazole (208.1 mg, 1.0 mmol), Pd/C (10 wt percent, dry powder, reduced) (20 mg) and THF (5 mL). The mixture was treated at rt with triethylsilane (320 µL, 2.0 mmol) and then stirred under nitrogen for 14 h at rt. The mixture was filtered through a 0.45 µM PTFE syringe filter and the filtrate was concentrated in vacuo. The residue was purified by column chromatography (0 to 10percent MeOH/ dichloromethane) to afford benzimidazole as a colorless solid (117.6 mg, 0.996 mmol 99percent). The reactions generally exhibit an induction period of 5 to 30 min as indicated by the initiation of gas release (i.e., bubbling) from the reaction mixture. The use of Pd/C on a dry matrix is imperative as wet Pd/C results in decreased yield or no reaction.A. Part B.

Molecular Weight:132.16
XLogP3:1.9
Hydrogen Bond Donor Count:1
Hydrogen Bond Acceptor Count:1
Exact Mass:132.068748264
Monoisotopic Mass:132.068748264
Topological Polar Surface Area:28.7
Heavy Atom Count:10
Complexity:124
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes