Methane → HCID 25265770, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of crude [(2R)-3-(2-{2-chloro-6-[(2R)-2,4-dimethyl-1-piperazinyl]-5-fluoro-4-pyrimidinyl}hydrazino)-2-(cyclopentylmethyl)-3-oxopropyl][(phenylmethyl)oxy]formamide (assumed 176.57 g, 314.1 mmol) in MeOH (800 mL) was added 20% Pd(OH)2/C (14.13 g). The mixture was hydrogenated under balloon pressure with monitoring every 30 min until the reaction was judged to be complete (7 h). The mixture was then filtered through a glass fiber filter with MeOH washes. The resulting dark filtrate was concentrated in vacuo and purified by preparative reverse phase chromatography (Luna C18 (2) column; 10 microns; 101.6 mm×250 mm; 250 nm UV detection; 480 mL/min; 40 mg/mL sample concentration; 4 g injection mass; mobile phase A: 300 mmol aqueous ammonium formate at pH 4.0; mobile phase B: MeCN; method: 28% B for 9 min; 90% B for 9 min; 28% B for 5 min). The product solution fractions were combined and adjusted to pH 6.8 with aqueous NH4OH, and then stirred with Darco (50% weight load based on crude product) for 30 min at room temperature. The solution was then filtered through Celite. The filtrate was concentrated to a volume of 3.5 L, and the pH was adjusted from 5.6 to 8.5 with NH4OH, affording an orange precipitate. The aqueous phase was extracted 3 times with EtOAc, and then the combined organics were washed with water and brine. The organics were dried (Na2SO4), filtered, and concentrated in vacuo to a volume of 1 L, producing a tan precipitate. An equal volume of heptane (1 L) was added, and the mixture was cooled to 0° C. for 1 h. Then the product was isolated by filtration, washing with heptane, and dried under reduced pressure at 50° C. for 20 h to provide [(2R)-3-(2-{2-chloro-6-[(2R)-2,4-dimethyl-1-piperazinyl]-5-fluoro-4-pyrimidinyl}hydrazino)-2-(cyclopentylmethyl)-3-oxopropyl]hydroxyformamide (85.5 g, 57% yield for 2 steps) as a white solid. LCMS: (M+H)+: 472.2.

Provenance & Evidence