Diisopropylethylamine → 4-Cyano-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole-2-carboxylic acid [4-bromo-2-(4,4-dimethyl-cyclohex-1-enyl)-phenyl]-amide

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Reaction Steps

To a suspension of 4-bromo-2-(4,4-dimethyl-cyclohex-1-enyl)-phenylamine (0.640 g, 2.29 mmol) (prepared in the previous step) and 4-cyano-1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole-2-carboxylate potassium salt (0.700 g, 2.30 mmol) (prepared in this example, step (d)) in DCM (12 mL) was added DIPEA (0.800 mL, 4.60 mmol) and PyBroP (1.29 g, 2.76 mmol) and the mixture allowed to stir at RT for 10 h. The mixture was diluted with DCM (50 mL) and washed with NaHCO3 (2×50 mL) and the organic layer dried over Na2SO4 and concentrated. The title compound was eluted from a 20-g SPE with 1:1 DCM/hexanes to give 1.04 g (86%) of the title compound as a white solid. Mass spectrum (ESI, m/z): Calcd. for C25H33BrN4O2Si, 529.1 (M+H). found 529.1.

Provenance & Evidence