Water → HCID 178424113, compound

Temperature

150 °C

3-[3-(4-Methyl-benzo[b]thiophen-3-ylmethyl)-2-oxo-2,3-dihydro-benzimidazol-1-yl]-propionitrile (58 mg, 0.17 mmol), azidotrimethylsilane (0.047 mL, 0.33 mmol) and dibutyltin oxide (4.2 mg, 0.017 mmol) are dissolved in dry DMF (2.0 mL) in microwave vial. It is then heated at 150° C. for 2 hrs in microwave reactor. Then another 0.05 mL of azidotrimethylsilane and 4.0 mg of dibutyltin oxide are added and the mixture is heated for another 2 hr at 150° C. in microwave reactor. Then water (2 mL) is added and the mixture is extracted with EtOAc (2×30 mL). The organic layers are combined and extracted with 2.0M NaOH (2×30 mL). The NaOH layers are combined and washed with EtOAc (30 mL). Then the NaOH layers are acidified with 1.0M HCl to pH=3 and it is then extracted with EtOAc (2×30 mL). All the organic layers are combined, dried (MgSO4) and concentrated to give crude product. Purification by preparative TLC using 3% MeOH in CH2Cl2 affords 15 mg (65%) of 1-(4-Methyl-benzo[b]thiophen-3-ylmethyl)-3-[2-(1H-tetrazol-5-yl)-ethyl]-1,3-dihydro-benzimidazol-2-one. LCMS (ESMS): m/z 391.07 (M+H+).

1. temperaturethe mixture is heated for another 2 hr at 150° C. in microwave reactor
2. extractionthe mixture is extracted with EtOAc (2×30 mL)
3. extractionextracted with 2.0M NaOH (2×30 mL)
4. washwashed with EtOAc (30 mL)
5. extractionis then extracted with EtOAc (2×30 mL)
6. dry with materialdried (MgSO4)
7. concentrationconcentrated
8. customto give crude product
9. customPurification by preparative TLC

ORD record

ord-dbc0de715b8a42a38e4dc28d739c9f77

Source dataset

uspto-grants-2015_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09150556B2