Methylhydrazine → 4-Bromo-n-[4,6-dibromo-2-(n-methylhydrazinocarbonyl)phenyl]-1-(3-chloro-2-pyridinyl)-1h-pyrrole-2-carboxamide

Beteiligte Stoffe

Reaktionsschritte

A mixture of 0.50 g of 6,8-dibromo-2-[4-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrrol-2-yl]-4H-3,1-benzoxazine-4-one, 0.15 ml of methylhydrazine and 8 ml of tetrahydrofuran was stirred at room temperature for 20 hours. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed successively with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 0.39 g of 4-bromo-N-[4,6-dibromo-2-(N-methylhydrazinocarbonyl)phenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrrole-2-carboxamide of the formula:

Herkunft & Nachweise