Pyridine → (S)-N-(5-bromo-3-(2-methylpyridin-3-yloxy)pyridin-2-yl)-3-(1,4-dioxaspiro[4.5]decan-2-yl)-1,2,4-thiadiazol-5-amine

Participants

Reaction Conditions

Reaction Steps

In 100 mL of acetonitrile was added sodium thioisocyanate (1.5 g, 20 mmol), pyridine (3.5 g, 44 mmol), followed by (R)—N-(methylsulfonyloxy)-1,4-dioxaspiro[4.5]decane-2-carbimidoyl chloride (5.2 g, 18 mmol) and the reaction heated to 60° C. for 30 minutes. 5-Bromo-3-(2-methylpyridin-3-yloxy)pyridin-2-amine (4.1 g, 15 mmol) was added and the reaction was heated overnight at 60° C. The reaction was concentrated to one quarter volume and the residue was partitioned between EtOAc and water made basic with 1N NaOH. The combined organic layers were separated and the aqueous layer extracted with EtOAc. The combined organic layers were washed with brine, dried over MgSO4 and concentrated in vacuo. The material was purified on silica gel (25% EtOAc in CH2Cl2) to afford (S)—N-(5-bromo-3-(2-methylpyridin-3-yloxy)pyridin-2-yl)-3-(1,4-dioxaspiro[4.5]decan-2-yl)-1,2,4-thiadiazol-5-amine (5.4 g, 73%).

Provenance & Evidence