反应详情

(2S,5R)-tert-butyl 5-(N-(allyloxy)-2-nitrophenylsulfonamido)-4-(dimethylcarbamoyl)-2-(hydroxymethyl)-5,6-dihydropyridine-1(2H)-carboxylate (Intermediate 139, 1.64 g, 3.03 mmol) and silver oxide (2.81 g, 12.13 mmol) were dissolved in acetonitrile (40 mL). To this solution was added iodomethane (1.897 mL, 30.34 mmol) under N2 and stirred over for 5 days protected from the light. The reaction mixture was then filtered through Celite, rinsed with EtOAc, and the crude product was loaded onto silica gel. The product was purified by flash chromatography (0-20% MeOH/DCM) to yield the desired product (1.643 g, 98%) as an off-white solid.

1. filtrationThe reaction mixture was then filtered through Celite
2. washrinsed with EtOAc
3. customThe product was purified by flash chromatography (0-20% MeOH/DCM)