Diisopropylethylamine → (S)-2-(4-chlorophenyl)-3-(cyclopropylmethylamino)-1-(4-((5R,7R)-7-fluoro-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)propan-1-one

Participants

Reaction Steps

(5R,7R)-7-Fluoro-5-methyl-4-(piperazin-1-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidine dihydrochloride (0.535 g, 1.730 mmol) and (S)-3-(tert-butoxycarbonyl(cyclopropylmethyl)amino)-2-(4-chlorophenyl)propanoic acid (0.6122 g, 1.730 mmol) were combined in methylene chloride (15 mL) and treated with diisopropylethylamine (0.9041 ml, 5.191 mmol). HBTU (0.6579 g, 1.730 mmol) was then added. The reaction was stirred at ambient temperature for 16 hours. ESI MS looked excellent for desired product. The reaction was quenched with 10% Na2CO3, diluted with methylene chloride and separated. The aqueous portion was washed with methylene chloride (2×), and the combined organic layers were dried over Na2SO4 and concentrated in vacuo. The material was applied to a 40 mm samplet and air-dried. This was placed on top of a column (Biotage 40S) and eluted with 3:2 hexane/EtOAc. The major spot was collected to give tert-butyl (S)-2-(4-chlorophenyl)-3-(4-((5R,7R)-7-fluoro-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)-3-oxopropyl(cyclopropylmethyl)carbamate as a white solid (955 mg, 96%). LC/MS (APCI+) m/z 571.9 [M+H]+

Provenance & Evidence