Morpholine → 4-(5-Bromopyridin-3-yl)morpholine

Participants

Reaction Steps

To a solution of 3,5-dibromopyridine (XL) (1.68 g, 7.1 mmol) in dioxane (14 mL) was added morpholine (682 mg, 7.8 mmol), CsCO3 (3.24 g, 9.93 mmol) and xantphos (123 mg, 0.21 mmol). The solution was degassed before adding Pd2(dba)3 (195 mg, 0.21 mmol). The reaction was microwaved at 90° C. for 4 h. The reaction was poured into a mixture of CHCl3/H2O; the aqueous layer was separated, washed with water, then brine and concentrated under vacuum. The crude product was purified on a silica gel column (100% hexane→1:3 EtOAc:hexane) to give 4-(5-bromopyridin-3-yl)morpholine (XLI) as a yellow solid (1.12 g, 4.6 mmol, 65% yield). ESIMS found C9H11BrN2O m/z 244 (M+H).

Provenance & Evidence