Dimethyl Sulfoxide → Tert-butyl 6-(6-nitropyridin-3-yl)-2,6-diazaspiro[3.3]heptane-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

In a 25 mL pear-shaped flask, tert-butyl 2,6-diazaspiro[3.3]heptane-2-carboxylate (2.81 g, 14.2 mmol), 5-bromo-2-nitropyridine (2.88 g, 14.2 mmol), and TEA (1.58 g, 2.17 ml, 15.6 mmol) were combined with DMSO (12 ml) to give a light yellow solution. The reaction mixture was heated to 90° C. and stirred for 40 h. Cooled to 25° C. and the reaction mixture was diluted with 50 mL H2O and extracted with EtOAc (3×50 mL). The organic layers were combined, washed with sat NaCl (1×50 mL), dried over Na2SO4 and concentrated in vacuo. The purple oil was used crude in the subsequent reduction. (M+H)+=321 m/e.

Provenance & Evidence