Diisopropylethylamine → HCID 118162118, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 4-chloro-2-((3-chlorophenethyl)amino)pyrimidine-5-carbonitrile (600 mg, 2.04 mmol) and tert-butyl (3-amino-2,2-dimethylcyclobutyl)carbamate (490 mg, 2.29 mmol) in dioxane (20 mL) was added DIEA (738 mg, 5.73 mmol). The resulting mixture was stirred at 125° C. under microwave irradiation for 5 h. After removal of the organic solvent under reduced pressure, the residue was diluted with ethyl acetate and the organic layer ws washed with aqueous solution of ammonia chloride. The organic layer was separated and dried over sodium sulfate and concentrated under vacuum to give the crude product, which was purified by silica gel chromatography (10% to 33% ethyl acetate in petroleum) to afford the title compound (610 mg, 1.30 mmol, 63% yield) as a pale yellow solid. The racemic product (500 mg, 1.06 mmol) was separated by chiral preparative supercritical fluid chromatography (chiral column: OJ, Column size: 0.46 cm I.D.×25 cm L, 5 um; Mobile phase: CO2:MeOH:DEA=60:40:0.1, Flow: 2.5 mL/min, 220 nm T=35° C.) to give four isomers: tert-butyl ((1S,3S)-3-((2-((3-chlorophenethyl)amino)-5-cyanopyrimidin-4-yl)amino)-2,2-dimethylcyclobutyl)carbamate (peak 1, 100 mg, 0.21 mmol, 20% yield, RT=7.88 min, d.e.=100%, e.e. =100%), tert-butyl ((1R,3R)-3-((2-((3-chlorophenethyl)amino)-5-cyanopyrimidin-4-yl)amino)-2,2-dimethylcyclobutyl)carbamate (peak 3, 102 mg, 0.22 mmol, 20% yield, RT=9.37 min, d.e.=100%, e.e. =100%), tert-butyl ((1R,3S)-3-((2-((3-chlorophenethyl)amino)-5-cyanopyrimidin-4-yl)amino)-2,2-dimethylcyclobutyl)carbamate (peak 2, 85 mg, 0.18 mmol, 17% yield, RT=8.29 min, d.e.=100%, e.e. =100%) and tert-butyl ((1S,3R)-3-((2-((3-chlorophenethyl)amino)-5-cyanopyrimidin-4-yl)amino)-2,2-dimethylcyclobutyl)carbamate (peak 4, 82 mg, 0.17 mmol, 17% yield, RT=10.96 min, d.e.=100%, e.e. =100%). MS (ESI) m/z 471.2 [M+H]+

Provenance & Evidence