Potassium Carbonate → 5-(3-Methyl-1,2,4-oxadiazol-5-yl)-1-azabicyclo[3.3.1]nonane oxalate salt

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Reaction Steps

1-Azabicyclo[3.3.1]non-5-ylcarboxylic acid hydrochloride salt (D14) (1.79 g, 0.0087 mole) was treated with thionyl chloride (20 ml) and heated under reflux for 5 h. The solution was concentrated in vacuo to leave a white solid, which was taken up in chloroform (150 ml), treated with acetamide oxime (D17) (770mg, 0.0104 mole) and heated under reflux for 6 h. The reaction mixture was basified with saturated potassium carbonate solution and extracted with chloroform (3×80 ml). The combined extracts were dried (Na2SO4) and concentrated to leave a white solid, which was treated with xylene (200 ml) and heated under reflux for 1.5 h, using a Dean and Stark head to trap water formed. The reaction mixture was concentrated in vacuo to leave a yellow oil, which was chromatographed on silica gel eluting with 5% methanol/chloroform to give a colourless oil (1.60 g, 89%). This was converted to the oxalate salt and recrystallised from ethanol/ether to give the title compound (E9) as a white solid m.p. 168°-170° C.

Provenance & Evidence