Diisopropylethylamine → (R)-tert-butyl 3-((S)-1-(4-chlorophenyl)-2-(4-((5R,7S)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)-2-oxoethyl)morpholine-4-carboxylate

Participants

Reaction Steps

(S)-2-((R)-4-(tert-Butoxycarbonyl)morpholin-3-yl)-2-(4-chlorophenyl)acetic acid (0.051 g, 0.143 mmol) was combined with (5R,7S)-5-methyl-4-(piperazin-1-yl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-7-ol dihydrochloride (0.0440 g, 0.143 mmol), and then slurried in methylene chloride (1.4 mL). The suspension was treated with diisopropylethylamine (0.0749 mL, 0.430 mmol) and then with HBTU (0.0544 g, 0.143 mmol). The mixture was then stirred at ambient temperature for 60 hours. The reaction was quenched with 10% Na2CO3 and separated. The reaction mixture was washed with methylene chloride (3×), and the combined organics were then dried with Na2SO4 and concentrated in vacuo. The resulting residue was subjected to chromatography on SiO2 (Biotage 12M) eluting with methylene chloride (96 mL) then 0% to 5% MeOH/methylene chloride (500 mL) and 5% MeOH/methylene chloride (96 mL). The desired material eluted cleanly in approximately 1% MeOH/methylene chloride to yield (R)-tert-butyl 3-((S)-1-(4-chlorophenyl)-2-(4-((5R,7S)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)-2-oxoethyl)morpholine-4-carboxylate as an oil. (81.2 mg, 99%).

Provenance & Evidence