Reaktion #992705

Reaktionsgleichung

methylamine

1-[[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]carbonyl]-5-chloro-7-methyl-1H-indole-2,3-dione

acetonitrile

methylamine

→

title product

3-bromo-N-[4-chloro-2-methyl-6-[(1E)-2-(methylamino)-1-(methylimino)-2-oxoethyl]phenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwarmed to 0° C.
2. 2
   FiltrationFinally the reaction mass was filtered
3. 3
   Waschenthe solids were washed with acetonitrile (3×2 mL)
4. 4
   Sonstigedried under nitrogen

Vorschrift

A suspension of 1-[[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]carbonyl]-5-chloro-7-methyl-1H-indole-2,3-dione (i.e. the crude product of Example 5) (4.80 g, 10 mmol) in acetonitrile (15 mL) was cooled to −10° C., and liquefied methylamine (0.35 g, 11 mmol) was added. The mixture was stirred for 1 hour at −10° C., then warmed to 0° C., and three more portions of liquefied methylamine (each 0.35 g, 11 mmol) were added periodically. Finally the reaction mass was filtered, and the solids were washed with acetonitrile (3×2 mL) and dried under nitrogen to afford the title product, a compound of the present invention, as off-white solids, 1.09 g. Almost immediately, more solids began to precipitate from the filtrate. These were filtered, washed with acetonitrile (3×2 mL), and dried under nitrogen to afford a second crop of the title product as light yellow crystals, 2.91 g, m.p. 230-234° C. (decomp.). The total isolated yield from both crops was 4.00 g (76.3%).

Quelle