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The reaction of trifluoromethyl-containing enones with hydroxylamine under various conditions is studied. The products in basic medium are equilibrating mixtures of isoxazolidine diastereomers in an ∼1∶1 ratio. The energy of the nitrogen atom inversion barrier in these compounds is 50–60...
New trans-bis(5-R-pyrimidin-2-yl)-1,4-cyclohexanes and-1,2-ethanes (R=C 7 H 15 , C 6 H 4 OR 1 , where R 1 =H, COCH 3 , C 4 H 9 , C 5 H 11 , C 8 H 17 ) have been synthesized. Only nematic mesophases are found from a study of their mesomorphic properties, except for bis(5-(4-octyloxyphenyl)-...
6-Phenyl-, 2-methyl-6-phenyl-, and 2,6-diphenyl-4-pyrimidinylidenemalononitrile in acetic acid react with HNO 3 to form the corresponding 4-ethoxycarbonylpyrimidines in high yields after treatment of the intermediate product with ethanol. Under the same conditions...
Nucleophilic substitution of the chlorine atom in 2-chloro-3-cyano-6-methoxymethyl-4-methylpyridine by mercapto group produces the corresponding 2(1H)-pyridinethione, alkylation of which by halogenated compounds in the presence of KOH proceeds regioselectively to form S-alkyl derivatives....
Vilsmeier formylation of 1,3-dialkylperimidones, 1,3-dialkyl-2,3-dihydroperimidines, and 2-trifluoromethyl-perimidines is performed. The 1 H NMR spectra of the resulting mono- and dialdehydes are discussed.
Intramolecular diene cycloaddition of 5-acyl-1,2,4-triazineoxime ethers involving a dienophile substituent in the 3-position of the triazine ring is studied. New alkylhetarylketones are synthesized by hydrolysis of the condensed N- and O-containing heterocyclic products. The starting materials...
The reaction of 6-bromo-7-cyclopropyl-1,4-benzodioxane with N 2 O 4 in methylene chloride does not affect the cyclopropane ring and forms the nitrodebrominated product (ipso-substitution). The same reaction of 6-nitro- and 5,6-dinitro-7-cyclopropyl-1,4-benzodioxanes produces only the products...
Reaction of 5-amino-1,3-dimethylpyrrolo(3,2-d)pyrimidine-2,4-(1H,3H)-diones with β-diketones produces enaminoketones. Some of these are converted by Lewis acids into pyrrolopyridazines.
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