Abstract
Acylation of benzene and toluene with 5-phenyl- and 5-(p-tolyl)isoxazole-3-carbonyl chlorides gave 5-phenyl(or p-tolyl)isoxazol-3-yl phenyl(or p-tolyl)ketones which were reduced to the corresponding alcohols with sodium tetrahydridoborate in propan-2-ol. Selective reduction of the carboxy group in 4,5-dichloroisothiazole-3-carboxylic acid was achieved by the action of BH3, and the aldehyde group in 4-formyl-2-methoxyphenyl 5-arylisoxazole-3-carboxylates and 4,5-dichloroisothiazole-3-carboxylates was reduced to hydroxymethyl group with sodium triacetoxyhydridoborate in benzene. Acylation of the resulting hydroxymethyl derivatives with 5-arylisoxazole- and 4,5-dichloroisothiazole-3-carbonyl chlorides afforded the corresponding esters containing two azole fragments in their molecules.
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Original Russian Text © V.I. Potkin, S.K. Petkevich, A.V. Kletskov, E.A. Dikusar, Yu.S. Zubenko, N.A. Zhukovskaya, V.V. Kazbanov, S.G. Pashkevich, 2013, published in Zhurnal Organicheskoi Khimii, 2013, Vol. 49, No. 10, pp. 1543–1553.
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Potkin, V.I., Petkevich, S.K., Kletskov, A.V. et al. Synthesis of functionally substituted isoxazole and isothiazole derivatives. Russ J Org Chem 49, 1523–1533 (2013). https://doi.org/10.1134/S1070428013100205
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DOI: https://doi.org/10.1134/S1070428013100205