Stannous chloride dihydrate → 5-Bromo-N2-methylpyridine-2,3-diamine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A suspension of (5-bromo-3-nitro-pyridin-2-yl)-methyl-amine (Stage 67.1.5, 4.58 g, 19.75 mmol) and tin dichloride dihydrate (Acros, Basel, Switzerland, 13.38 g, 59.3 mmol) in 200 ml of THF was heated at 70° C. for 220 min. The solvent was removed by evaporation and the residue taken in CH2Cl2 (100 ml) and 5 M aqueous NaOH (50 ml) and stirred until all the solid was dissolved. The organic layer was separated and the aqueous layer was extracted with CH2Cl2. The combined organic layers were washed with brine, dried over Na2SO4, filtered and evaporated to give the title compound as a brown solid. (HPLC: tR 1.69 min (Method A); M+H=202, 204 MS-ES).

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