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. 2015 Aug 14;20(8):14936–14949. doi: 10.3390/molecules200814936

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© 2015 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — N-alkylation of 4-dimethylaminopyridine under ultrasonic irradiation conditions. RX/toluene, 80 °C, 5 h. R = –(CH₂)₂OH for 1; –(CH₂)₃OH for 2; –(CH₂)₂OCH₃ for 3; –(CH₂)₂OCH₂CH₃ for 4; –(CH₂)₄OPh for 5; –(CH₂)₃CN for 6; X = Cl, Br.