Addition products of hydrazine derivatives to azo-alkenes, part V: The reaction of ?-(1-phenylhydrazino)alkanone phyenylhydrazones with acids and acid derivatives
摘要:
The bifunctional title compounds 2 react with acylating, carbamoylating and sulfonylating reagents mostly at the primary amino group of the hydrazine function. Both functional groups of 2 are attacked by N,N'-carbonyldiimidazole converting it into 1H-1,2,4,5-tetrazepin-3-one derivatives 8. The acid-induced 1,4-elimination of phenylhydrazine from 2 gives rise to the formation of phenylosazones 3. In the presence of thiocyanic acid the intermediately formed phenylazo-alkenes 1 undergo [3 + 2]-cycloaddition furnishing 1-anilino-imidazoline-2-thiones 13.
α-(1-phenylhydrazino)-alkanone phenylhydrazones: The reaction with carbonyl compounds
作者:Joachim G. Schantl、Peter Karpellus、Michael Prean
DOI:10.1016/s0040-4020(01)87787-5
日期:——
The unsymmetricallydisubstitutedhydrazines 1 were condensed with carbonyl compounds. Some of the expected condensation products were isolated, but some were formed as unstable intermediates which underwent 1,4-elimination: The phenylhydrazone of the carbonyl compound used was obtained, together with the corresponding phenylazo-alkene 11 or alternatively, the 1,4-addition product of a different protic