Diisopropylethylamine → 2-(bicyclo[1.1.1]pentan-1-ylamino)-4-((1S,3S)-3-hydroxy-4,4-dimethylcyclohexylamino)pyrimidine-5-carboxamide

Participants

Reaction Conditions

Reaction Steps

To a stirring suspension of 2-(bicyclo[1.1.1]pentan-1-ylamino)-4-(methylsulfinyl)pyrimidine-5-carboxamide (397 mg, 1.491 mmol) and a mixture of (1R,5R)-5-amino-2,2-dimethylcyclohexanol hydrochloride and (1S,5S)-5-amino-2,2-dimethylcyclohexanol hydrochloride (348 mg, 1.938 mmol, synthesis described herein) in DMF (4.88 mL) was added DIEA (0.78 mL, 4.47 mmol) and the reaction was heated to 90° C. overnight. The crude reaction mixture was poured into 60 mL of ice water. The resulting solids were slurried for ˜1 h, filtered, rinsed with water and dried for a few hours in a vacuum oven at 45° C. to afford a mixture of 2-(bicyclo[1.1.1]pentan-1-ylamino)-4-((1R,3R)-3-hydroxy-4,4-dimethyl-cyclohexylamino)pyrimidine-5-carboxamide and 2-(bicyclo[1.1.1]pentan-1-ylamino)-4-((1S,3S)-3-hydroxy-4,4-dimethylcyclohexylamino)pyrimidine-5-carboxamide (481 mg, 1.392 mmol, 93% yield). This material was separated by preparative chiral SFC utilizing a ChiralPak AD-H, 250×30 mm I.D. column with an isocratic 40% ethanol+0.1% ammonium hydroxide in CO2 gradient at 120 mL/min flow rate and at 38° C. The faster eluting isomer was denoted as peak 1 and 132 mg (0.382 mmol) was obtained. The slower eluting isomer was denoted as peak 2 and 120 mg (0.349 mmol) was obtained.

Provenance & Evidence