Toluene → (S)-2-methyl-4-(6-morpholino-5-nitropyridin-3-yl)morpholine

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Reaction Steps

A solution of 4-(5-chloro-3-nitropyridin-2-yl)morpholine (2 g, 8.21 mmol; described herein), 2-methylmorpholine (996 mg, 9.85 mmol), tris(dibenzylideneacetone)dipalladium(0) (526 mg, 0.58 mmol), 2-(dicyclohexylphosphino)-2,4,6,-tri-i-propyl-1,1-biphenyl (587 mg, 1.23 mmol), sodium 2-methylpropan-2-olate (1.6 g, 16.4 mmol), and toluene (126 mL, 119 mmol) was refluxed overnight then cooled to rt and concentrated. The resulting residue was taken up in EtOAc, washed with satd aq. sodium bicarbonate and brine, and the organic layer dried (magnesium sulfate) and concentrated. Column chromatography and chiral separation afforded (S)-2-methyl-4-(6-morpholino-5-nitropyridin-3-yl)morpholine and (R)-2-methyl-4-(6-morpholino-5-nitropyridin-3-yl)morpholine as red solids (absolute configuration not determined and assigned randomly). Mass Spectrum (ESI) m/e=309.2 (M+1).

Provenance & Evidence