Trifluoroacetic acid → HCID 57497158, compound

Participants

Reaction Steps

To a solution of [(S)-4-(5-bromo-2-fluoro-phenyl)-1,4,5,5-tetramethyl-6-oxo-1,4,5,6-tetrahydro-pyrimidin-2-yl]-carbamic acid tert-butyl ester (intermediate E8, 7.0 g) in dichloromethane (100 ml) was added trifluoroacetic acid (36.3 ml) and stirring was continued at 22° C. for 4 h. The mixture was evaporated and the residue partitioned between saturated aqueous NaHCO3 and dichloromethane, the organic layer was dried and evaporated and the residue triturated with n-pentane to give the intermediate (S)-2-amino-6-(5-bromo-2-fluoro-phenyl)-3,5,5,6-tetramethyl-5,6-dihydro-3H-pyrimidin-4-one (5.4 g) as a white solid. To a solution of the intermediate (0.88 g) in dichloromethane (13 ml) was added 4,4′-dimethoxytrityl chloride (0.96 g) and triethylamine (0.52 g) and stirring was continued at 22° C. for 2 h. The solution was washed with water, the organic layer was dried, evaporated and the residue was purified by chromatography over silica using AcOEt/n-heptane, gradient from 0 to 20% AcOEt) to give (S)-2-{[bis-(4-methoxy-phenyl)-phenyl-methyl]-amino}-6-(5-bromo-2-fluoro-phenyl)-3,5,5,6-tetramethyl-5,6-dihydro-3H-pyrimidin-4-one as (1.61 g) as a pale blue solid. MS (ESI): m/z=642.3 and 644.3 [M+H]+.

Provenance & Evidence