Cesium carbonate → tert-butyl {4-[(1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-benzimidazol-2-yl)oxy]phenyl}carbamate

HRID 1429924Notes

Reaction equation

Cl[C:2]1[N:6]([CH2:7][O:8][CH2:9][CH2:10][Si:11]([CH3:14])([CH3:13])[CH3:12])[C:5]2[CH:15]=[CH:16][CH:17]=[CH:18][C:4]=2[N:3]=1.[OH:19][C:20]1[CH:25]=[CH:24][C:23]([NH:26][C:27](=[O:33])[O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[CH:22][CH:21]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C>[CH3:12][Si:11]([CH3:14])([CH3:13])[CH2:10][CH2:9][O:8][CH2:7][N:6]1[C:5]2[CH:15]=[CH:16][CH:17]=[CH:18][C:4]=2[N:3]=[C:2]1[O:19][C:20]1[CH:21]=[CH:22][C:23]([NH:26][C:27](=[O:33])[O:28][C:29]([CH3:31])([CH3:30])[CH3:32])=[CH:24][CH:25]=1

Participants

Conditions

Temperature: 60 °C

Procedure

A mixture of 2-chloro-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-benzimidazole (8.7 g), tert-butyl 4-hydroxyphenylcarbamate (6.4 g) and cesium carbonate (20 g) in DMF (60 mL) was stirred at 60° C. for 24 h. After cooling to room temperature, to the mixture was added SiO2, the mixture was evaporated, and then the residue was purified by column chromatography (silica gel, eluted with 0%-50% EtOAc in hexane) to give tert-butyl {4-[(1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-benzimidazol-2-yl)oxy]phenyl}carbamate (14 g) as brown oil.

Workup

temperatureAfter cooling to room temperature, to the mixture
additionwas added SiO2
customthe mixture was evaporated
customthe residue was purified by column chromatography (silica gel, eluted with 0%-50% EtOAc in hexane)

Sources & evidence

ORD record: ord-9bd2075b6b3941a49b05cfed7728f50b
Source dataset: uspto-grants-2015_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08940758B2

Reaction notes

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