Reaction of 2-(2-oxoethylidene)furan-3(2H)-ones with isopropylidenehydrazides of aromatic carboxylic acids: Synthesis of 3-hydroxy-3-(2-oxoethyl)-2,3-dihydropyridazin-4(1H)-ones
2-p-Chlorobenzoylmethylene-5-phenyl-2,3-dihydro-3-furanone reacts with arylamines or N-arylideneamines to form the products of ring opening, 1,6-diaryl-1-arylamino-4-hydroxy-1,4-hexadiene-3,6-diones. The reaction of 5-aryl-2-p-chlorobenzoylmethylene-2,3-dihydro-3-furanones with o-aminophenol afforded 3-p-chlorobenzoylmethylene-3,4-dihydro-2H-benzo[b]-1,4-oxazin-2-one. Nucleophilic attack of amines is directed either to electrophilic centers at the C(5) and C(2) atoms or to the carbonyl group of the 2-phenacylidene substituent of the 3-oxofuran ring.
Chemistry of 2-ylidenefuran-3(2H)-ones: XIX. Reaction of 5-aryl-2(oxoylidene)furan-3(2H)-ones with carboxylic acid hydrazides
作者:E. N. Koz’minykh、V. I. Goncharov、V. O. Koz’minykh
DOI:10.1134/s1070428007060115
日期:2007.6
2-[2-(4-Chlorophenyl)-2-oxoethylidene]-5-phenylfuran-3(2H)-one and methyl (5-aryl-3-oxo-2,3-dihydrofuran-2-ylidene)acetates react with carboxylic acid hydrazides to give the corresponding 3-substituted 2-acyl-6-aryl-3-hydroxy-2,3-dihydropyridazin-4(1H)-ones. Specificities of the product structure are discussed.
Koz'minykh; Igidov; Koz'minykh, Russian Journal of Organic Chemistry, 2000, vol. 36, # 9, p. 1341 - 1345