Trifluoroacetic acid → (S)-4-(2-fluoro-5-((2-methyl-4-(methylsulfonyl)piperazin-1-yl)methyl)pyridin-3-yl)-N,N-bis(4-methoxybenzyl)-6-methyl-1,3,5-triazin-2-amine

Participants

Reaction Steps

A stirred solution of (S)-tert-butyl 4-((5-(4-(bis(4-methoxybenzyl)amino)-6-methyl-1,3,5-triazin-2-yl)-6-fluoropyridin-3-yl)methyl)-3-methylpiperazine-1-carboxylate (10.386 g, 15.79 mmol) in DCM (25.0 mL, 389 mmol) was cooled in an ice bath and slowly treated with TFA (25.0 mL, 324 mmol). The resulting mixture was stirred at room temperature for 1 h and then concentrated. The sticky residue was taken up in DCM (100 mL) and cooled to −45° C. TEA (22.0 mL, 158 mmol) was then added via additional funnel, followed by slow addition of methanesulfonyl chloride (6.15 mL, 79 mmol) in DCM (20 mL). The heterogeneous mixture was stirred at −30° C. for 30 min and then quenched with water and NH4Cl(aq) (50 mL each). The organic layer was separated, and the aqueous layer was extracted with DCM (2×50 mL). The combined organic layers were then washed with brine, dried over Na2SO4, and concentrated to give (S)-4-(2-fluoro-5-((2-methyl-4-(methylsulfonyl)piperazin-1-yl)methyl)pyridin-3-yl)-N,N-bis(4-methoxybenzyl)-6-methyl-1,3,5-triazin-2-amine (13.6 g crude) as a pale-yellow foam, which was taken directly to the next step without further purification. m/z (ESI, +ve ion) 636 (M+H)+.

Provenance & Evidence