1972 Volume 45 Issue 7 Pages 2055-2057
In a continuation of our previous papers concerning the syntheses with 5-nitro-2-furonitrile, 2-(5-nitro-2-furyl)vinyl-1,2,4-oxadiazoles and -1,2,3-triazoles were prepared from 3-(5-nitro-2-furyl)acrylonitrile (I). When I was treated with diazomethane in ether, 4-[2-(5-nitro-2-furyl)vinyl]-1,2,3-triazole (II) was obtained. II gave N-acetyl (IIa) and N-morpholinomethyl (IIb) compounds when treated with acetic anhydride and when the Mannich reaction was utilized respectively. 3-(5-Nitro-2-furyl)acrylamide oxime (III) was prepared by the usual method from I and hydroxylamine. The treatment of III with benzaldehyde and acid anhydrides or chlorides afforded 3-[2-(5-nitro-2-furyl)vinyl]-5-phenyl-4,5-dihydro-1,2,4-oxadiazoline (IV) and O-acyl-3-(5-nitro-2-furyl)acrylamide oximes (IIIa—IIIe) respectively. The O-acyl-amide oximes were found to cyclize to 3-[2-(5-nitro-2-furyl)vinyl]-5-alkyl-1,2,4-oxadiazole (V–VII) in their thermal analyses.
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