Hydrochloric Acid → (S)-2-(4-chlorophenyl)-1-(4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)-2-((S)-pyrrolidin-2-yl)ethanone

Participants

Reaction Steps

(S)-tert-butyl 2-((S)-1-(4-chlorophenyl)-2-(4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)-2-oxoethyl)pyrrolidine-1-carboxylate (0.74 g, 1.331 mmol) was dissolved in dioxane (3 mL) and treated with 4M hydrogen chloride in dioxane (8.317 mL, 33.27 mmol). The mixture was stirred at ambient temperature for 8 hours. The reaction was concentrated in vacuo, re-dissolved and re-concentrated from MeOH three times. Then the residue was re-dissolved in MeOH (3 mL) and added dropwise to stirred Et2O (100 mL). After stirring for 30 minutes, the solid was collected, washed with Et2O, and then air-dried under a blanket of nitrogen. (S)-2-(4-Chlorophenyl)-1-(4-((5R,7R)-7-hydroxy-5-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazin-1-yl)-2-((S)-pyrrolidin-2-yl)ethanone was recovered as a white solid, (0.47 g, 79%). MS (ESI+) [M+H] 456.1/458.1

Provenance & Evidence