[CH:1]1([C:4]2[O:8][N:7](C)[CH:6](NC=O)[N:5]=2)[CH2:3][CH2:2]1.[CH2:13]([N:15](CC)[CH2:16]C)C.O=P(Cl)(Cl)Cl.C([O-])([O-])=O.[Na+].[Na+]>C(Cl)Cl.O>[CH:1]1([C:4]2[O:8][N:7]=[C:6]([CH2:16][N+:15]#[C-:13])[N:5]=2)[CH2:2][CH2:3]1
A stirred solution of 5-cyclopropyl-3-formylamino-methyl-1,2,4-oxadiazole (60 mmol) and triethylamine (176 mmol) in CH2Cl2 (100 ml) was charged dropwise with POCl3 (60 mmol) at 0° C. The mixture was then left for 30 min. with stirring at 0° C., whereafter a solution of Na2CO3 (60 mmol) in H2O (50 ml) was added. The mixture was heated to room temperature, whereafter the organic phase was separated, dried and evaporated in vacuo. The residue was treated with ether, decanted and the solution was evaporated to give the title compound as an oil.
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