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

HRID 587469Notes

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-0956a374da1f4cdb94bebfb1f4856c29
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09226921B2

Reaction notes

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