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Bromomethyl (E)-2-phenylethenyl and bromomethyl (Z)-1-bromo-2-phenylethenyl sulfones undergo condensation with enolates generated from malononitrile, dimethyl malonate, methyl and ethyl acetoacetate using NaH in THF to give tetrahydrothiophene S,S-dioxides. Methyl (E)-1-bromo-2-phenylethenyl and...
Reaction of 4,11-diaryl-1,2,8,9-tetraazadispiro(126.96.36.199)tetradeca-1,8-dien-6-ones and-dispiro(188.8.131.52)trideca-1,8-dien-6-ones with chlorine gives substituted dispirocyclic compounds containing a 3-chloro-1-pyrazoline fragment which loses nitrogen on heating to give spirocyclic chlorocyclopropanes.
The cyclocondensation of aromatic o-halo ketones and o-halo nitriles with ethyl 3,3-diaminoacrylate proceeds as the replacement of the aromatic halogen by the α-carbon atom of the enediamine, while the amino group of the enediamine is bound by the α-carbon atom of the ketone or nitrile group.
Information on the synthesis of tryptamines using the Fischer reaction is reviewed. A comparative analysis is made of the methods of production and the reactivity of the various synthetic precursors and latent forms of aminobutanal — the carbonyl component in the synthesis of tryptamines by the...
By condensation of tert-butyl 3-methyl-7-oxoceph-3-em-4-carboxylate and its 3-acetoxymethyl analog with acetylmethylenetriphenylphosphorane and 3-trimethylsilylpropyn-2-ylindenetriphenylphosphorane tert-butyl 7Z-acetylmethylene-3-methylceph-3-em-4-carboxylate and also 7Z-and 7E-isomers of...
Cyclocondensation of N-prop-2-ynyl-o-phenylenediamine with phenyl isothiocyanate leads to the formation of 1-(3-arylprop-2-ynyl)-2,3-dihydro-1H-benzimidazole-2-thiones. In the reactions of diacetylene derivatives — N-penta-2,4-diynyl-o-phenylenediamine — with phenyl isothiocyanate the...
The reaction of ethyl 3,3-diaminoacrylate with quinoline-3-carbaldehydes and 3-nitrobenzaldehydes to give a dihydropyridine and condensed azine has been studied with respect to the number and reactivity of the halogen atoms in an ortho position to the formyl groups. For the series of...
The reactions of 1,1-diaryl-2-(diphenylvinylidene)cyclopropanes and 1,1-diaryl-2-(2-phenylpropenylidine) cyclopropanes with aromatic amines in the presence of BF 3 ·Et 2 O leads to the formation of pyrrolidine derivatives.
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