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Data of the last 15 years on the synthesis and properties of various thiacrown compounds containing 2–8 sulfur atoms in the ring are reviewed.
The Mannich aminoalkylation of 2,4,5-trimethyl-1,2,3,4-tetrahydropyrrolo(1,2-c)pyrimidine and condensation of its 7-formyl derivative with aniline have been studied. 7-Morpholinomethyl- and 7-(N-methylpiperazinylmethyl)-substituted derivatives have been isolated. 7-Dimenthylaminomethyl- and...
Reaction of 4-amino-3-carbethoxy-1,2-dihydrospiro(naphthalene-2,1′-cycloalkanes) with p-tolylisothio-cyanate gave 4-oxo-2-thioxo-3-p-tolyl-1,2,3,4,5,6-hexahydro(benzo(h)quinazoline-5,1′-cycloalkanes) which could be alkylated using various halo compounds to yield the corresponding S-alkyl...
The condensation of acetaldehyde with cyanothioacetamide and ethyl benzoylacetate in the presence of N-methylmorpholine leads to the formation of 3-cyano-5-ethoxycarbonyl-4-methyl-6-phenylpyridine-2(1H)-thione. Alkylation of the last afforded the corresponding substituted 2-alkythiopyridines.
The reaction of 3-amino-9-alkylcarbazoles with acrylic and itaconic acids yields N-substituted amino acids, which were converted into derivatives of 4-carboxy-2-pyrrolidinone and dihydropyrimidinedione.
The reactions of phenoxathiin-2-carbonyl-or thianthrene-2-carbonyl-isothiocyanates with certain primary amines lead to the formation of corresponding N′-substituted-N-hetaroylthiocarbamides. The aforementioned isothiocyanates were obtained in situ by reactions of phenoxathiin-2-or...
Reaction of substituted phthalic acids or their anhydrides (including pyromellitic dianhydride) with salts of N-carboxymethylpyridinium and substituted N-carboxymethylpyridinium in the presence of acetic anhydride and triethylamine in acetonitrile or acetic acid solutions gave a series of novel...
Isomeric conversion of 3,5-dichloro-3-cyano-4-methylpyridine-2,6(1H)-dione to 5,5-dichloro-3-cyano-4-methylpyridine-2,6(1H)-dione in polar solvents was shown. A new method for the synthesis of 5-chloro-3-cyano-6-hydroxy-4-methylpyridin-2-one was proposed.
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