Triphenylphosphine → (R)-tert-butyl 3-((R)-(4-chloro-3-fluorophenyl)(4-(2-(methylthio)pyrimidin-4-yl)-2-oxopyridin-1(2H)-yl)methyl)pyrrolidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

(3R)-tert-Butyl 3-((4-chloro-3-fluorophenyl)(hydroxy)methyl)pyrrolidine-1-carboxylate (640 mg, 1.943 mmol) was dissolved in DCM (4.9 mL, 0.2M) under nitrogen, treated with triphenylphosphine (637.0 mg, 2.429 mmol) and cooled to 0° C. Diisopropyl azodicarboxylate (478.2 μL, 2.429 mmol) was added by syringe. After 5 minutes, the mixture was warmed to room temperature and stirred for 10 minutes prior to being treated with 4-(2-(methylthio)pyrimidin-4-yl)pyridin-2(1H)-one (213 mg, 0.9714 mmol). The mixture was then stirred at room temperature for 16 hours. After concentration by rotovap and high vacuum, the mixture was loaded onto a C18 reverse phase column and eluted with a gradient of 5% acetonitrile to 100% acetonitrile in water. The mixture of diastereomers isolated were then loaded onto an SP1 samplet and purified by silica gel chromatography using a 20% to 80% gradient of MTBE in dichloromethane. Fractions containing each diastereomer were isolated and concentrated to afford (R)-tert-butyl 3-((R)-(4-chloro-3-fluorophenyl)(4-(2-(methylthio)pyrimidin-4-yl)-2-oxopyridin-1(2H)-yl)methyl)pyrrolidine-1-carboxylate from the higher rf spot and (R)-tert-butyl 3-((S)-(4-chloro-3-fluorophenyl)(4-(2-(methylthio)pyrimidin-4-yl)-2-oxopyridin-1(2H)-yl)methyl)pyrrolidine-1-carboxylate as the lower rf spot, both as oils (54 mg, 10% yield and 48 mg, 9% yield respectively).

Provenance & Evidence