Diisopropylethylamine → Racemic tris(1,1-dimethylethyl) 2-{2-chloro-6-[1-(dimethylamino)-3-azabicyclo[3.1.0]hex-3-yl]-5-fluoro-4-pyrimidinyl}-1,1,2-hydrazinetricarboxylate

Participants

Reaction Steps

To a solution of racemic N,N-dimethyl-3-azabicyclo[3.1.0]hexan-1-amine dihydrochloride (assumed 0.5339 g, 2.681 mmol) in DMF (13 mL) was added tris(1,1-dimethylethyl) 2-(2,6-dichloro-5-fluoro-4-pyrimidinyl)-1,1,2-hydrazinetricarboxylate (1.33 g, 2.674 mmol) and N,N-diisopropylethylamine (1.87 mL, 10.74 mmol). The solution was stirred overnight and then diluted with Et2O (100 mL). The mixture was washed with water (2×50 mL), and the combined aqueous phase was extracted with a fresh portion of Et2O (50 mL). The combined organic phase was dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. The residue was purified by gradient silica gel chromatography (0% to 100% EtOAc in hexanes; 1% Et3N) to afford racemic tris(1,1-dimethylethyl)2-{2-chloro-6-[1-(dimethylamino)-3-azabicyclo[3.1.0]hex-3-yl]-5-fluoro-4-pyrimidinyl}-1,1,2-hydrazinetricarboxylate (1.3261 g, 84%) as a white foam. LCMS: (M+H)+: 587.3.

Provenance & Evidence