m-Chloroperbenzoic acid → US9656988, Example 60

Participants

Reaction Steps

To a solution of 3-(methylthio)-5-(4-(morpholine-4-carbonyl)phenylamino)-1,2,4-triazine-6-carboxamide (170 mg, 0.46 mmol) in NMP (20 mL) was added mCPBA (77% strength, 310 mg, 1.38 mmol). The mixture was stirred at RT for 1 h to yield a mixture of corresponding sulfone and sulfoxide. To the mixture was then added DIEA (0.40 mL, 2.30 mmol) and (R)-tert-butyl 3-aminopiperidine-1-carboxylate (184 mg, 0.92 mmol). The mixture was heated at 90° C. for 90 m. The mixture was cooled, diluted with 300 mL EtOAc, washed with 1N NaOH and brine, dried, and concentrated in vacuo. The residue was subjected to flash column chromatography with 0 to 6% MeOH in DCM to yield the title compound (74) (210 mg, 87% yield). MS found C25H34N8O5 as (M+H)+ 527.2, (M−H)− 525.3. UV: λ=252, 267, 283 nm.

Provenance & Evidence