N-((1,1-dimethylethoxy)carbonyl)-2-methyl-alanine → 1,1-Dimethylethyl (1,1-dimethyl-2-oxo-2-{[6-(spiro[1-benzofuran-3,1'-cyclopropan]-4-yloxy)-3-pyridinyl]amino}ethyl)carbamate

Participants

Reaction Steps

To a solution of N-{[(1,1-dimethylethyl)oxy]carbonyl}-2-methylalanine (80 mg, 0.393 mmol) in dry N,N-dimethylformamide (1.5 mL) DIPEA (0.096 mL, 0.551 mmol) and then HATU (150 mg, 0.393 mmol) were added and the reaction mixture was stirred for 15 minutes at room temperature This solution was added to a solution of 6-(spiro[1-benzofuran-3,1′-cyclopropan]-4-yloxy)-3-pyridinamine (Intermediate 89, 40 mg) in dry N,N-dimethylformamide (0.5 ml) and the reaction mixture was stirred overnight at room temperature. The reaction was quenched with water (2 ml), diluted with brine (10 ml) and extracted with ethyl acetate (2×20 ml). The organic layer was dried over sodium sulphate, filtered and evaporated and the residue was purified by flash chromatography (Biotage system) on silica gel using a 10 g SNAP column and cyclohexane/ethyl acetate 8:2 to cyclohexane/ethyl acetate 1:1 as eluents affording the title compound as a white solid (52 mg).

Provenance & Evidence