Methyl iodide → N-((1R,2S)-3-(3,5-difluorophenyl)-1-hydroxy-1-((2R,4R)-4-propoxypyrrolidin-2-yl)propan-2-yl)-3-methoxy-5-(2-oxopyrrolidin-1-yl)benzamide

Participants

Reaction Conditions

Reaction Steps

Step 13 (A): (2R,4R)-tert-Butyl 2-((1S,2S)-1-(tert-butyldimethylsilyloxy)-3-(3,5-difluorophenyl)-2-(3-methoxy-5-(2-oxopyrrolidin-1-yl)benzamido)propyl)-4-propoxypyrrolidine-1-carboxylate. To a solution of (2R,4R)-tert-butyl 2-((1S,2S)-1-(tert-butyldimethylsilyloxy)-3-(3,5-difluorophenyl)-2-(3-hydroxy-5-(2-oxopyrrolidin-1-yl)benzamido)propyl)-4-propoxypyrrolidine-1-carboxylate (Preparation I, 27 mg, 0.037 mmol) in DMF (1 mL) were added cesium carbonate (24 mg, 0.074 mmol) and methyl iodide (25 mg, 0.185 mmol) and the reaction mixture was stirred at 80° C. for 3 h, at rt for 3 days and microwaved at 80° C. for 6 h. Ethyl acetate (100 mL) was added and the mixture was washed with H2O and concentrated under vacuum. The crude mixture was purified by silica gel Flash Chromatography (0% to 20% to 40% to 60% EtOAc/Hexane step gradient) to give 20 mg of the title compound: 1H NMR (CDCl3, 500 MHz) δ ppm 0.02 (3H, s), 0.07 (3H, s), 0.85 (9H, s), 0.88 (3H, m), 1.46-1.54 (11H, m), 2.02-2.07 (1H, m), 2.10-2.16 (2H, m), 2.20 (1H, m), 2.59 (2H, m), 2.64 (1H, dd, J=10, 15 Hz), 2.92 (1H, m), 3.28-3.37 (3H, m), 3.76 (1H, dd, J=5, 10 Hz), 3.84 (3H, s), 3.88-3.92 (2H, m), 3.98 (1H, m), 4.04-4.13 (2H, m), 4.58 (1H, m), 6.60 (1H, m), 6.78 (2H, d, J=5 Hz), 7.23 (1H, s), 7.34 (1H, s), 7.80 (1H, s), 8.05 (1H, brd s). MS (ESI) (M+H)+ 746.41.

Provenance & Evidence