Diisopropylamine → 2-methyl-5-nitro-N-(pyrimidin-5-yl)benzamide

Beteiligte Stoffe

Reaktionsschritte

In a 2 L round bottom flask with mechanical stirring was charged with 2-methyl-5-nitrobenzoic acid (20 g), HATU (38 g) and diisopropylamine (32 mL) in DMF (90 mL). This mixture was stirred for 30 min then pyrimidin-5-amine was added and the reaction was stirred for 18 hr. The LCMS showed complete conversion. DMF was removed under vacuum as much as possible then water was added and a solid precipitated out (use mechanical stirring). The tan solid was filtered and rinsed with water, then taken up in EtOAc, washed with brine, dried over MgSO4, filtered and concentrated down. The crude was taken up in EtOAc and the product 45 precipitated out. This was filtered and the filtrate was concentrated down and taken up in EtOAc/Hex. After standing overnight, more solids were filtered and were combined with the first crop. 2-methyl-5-nitro-N-(pyrimidin-5-yl)benzamide 45 was obtained as a light yellow solid.

Herkunft & Nachweise