4-Bromo-N,N-dimethylbenzenesulphonamide → 2-((5-(4-(bis(4-methoxybenzyl)amino)-6-methyl-1,3,5-triazin-2-yl)-6-(6-methoxypyridin-3-ylamino)pyridin-3-yl)(hydroxy)methyl)-4-bromo-N,N-dimethylbenzenesulfonamide

Participants

Reaction Conditions

Reaction Steps

A solution of 4-bromo-N,N-dimethylbenzenesulfonamide (Aldrich; 152 mg, 0.575 mmol) in THF (1.0 mL) was cooled to −78° C. and treated dropwise with n-butyllithium (1.60 M solution in hexanes) (359 μL, 0.575 mmol). The resulting pale solution was allowed to slowly warm to 0° C. over 30 min to give a dark brown solution which was then added dropwise to a suspension of 5-(4-(bis(4-methoxybenzyl)amino)-6-methyl-1,3,5-triazin-2-yl)-6-(6-methoxypyridin-3-ylamino)nicotinaldehyde (110.7 mg, 0.192 mmol) in THF (2.0 mL) cooled to −78° C. The mixture was stirred for 2 h, slowly allowing to warm to 0° C., and the resulting yellow suspension was quenched (water) and extracted into DCM from saturated aqueous NaHCO3. The extracts were dried (MgSO4), concentrated and purified by flash chromatography (0 to 10 to 20 to 30 to 40% EtOAc in DCM) to give recovered 5-(4-(bis(4-methoxybenzyl)amino)-6-methyl-1,3,5-triazin-2-yl)-6-(6-methoxypyridin-3-ylamino)nicotinaldehyde (54.6 mg, 49%, eluting off with 20% EtOAc/DCM) followed by 2-((5-(4-(bis(4-methoxybenzyl)amino)-6-methyl-1,3,5-triazin-2-yl)-6-(6-methoxypyridin-3-ylamino)pyridin-3-yl)(hydroxy)methyl)-4-bromo-N,N-dimethylbenzenesulfonamide (30.0 mg, 0.036 mmol, 18.60% yield) (eluting off with 30% EtOAc/DCM) followed by 4-((5-(4-(bis(4-methoxybenzyl)amino)-6-methyl-1,3,5-triazin-2-yl)-6-(6-methoxypyridin-3-ylamino)pyridin-3-yl)(hydroxy)methyl)-N,N-dimethylbenzenesulfonamide (38.3 mg, 0.050 mmol, 26.2% yield) (eluting off with 40% EtOAc/DCM).

Provenance & Evidence