613-21-8Relevant academic research and scientific papers
SN2 substitution on sp2 nitrogen of protonated oxime
Mori, Seiji,Uchiyama, Katsuya,Hayashi, Yujiro,Narasaka, Koichi,Nakamura, Eiichi
, p. 111 - 112 (2007/10/03)
Theoretical studies on intramolecular nucleophilic displacement of the prolonated oxime oxygen willi an aryl ring revealed that the substitution reaction on the sp2 nitrogen atom is a low energy process. This seemingly anomalous substitution is due to the low-lying σ*-orbital of the O-protonated oxime. The theoretical conclusion received experimental support.
Regioselective synthesis of quinolin-8-ols and 1,2,3,4- tetrahydroquinolin-8-ols by the cyclization of 2-(3-hydroxyphenyl)ethyl ketone 0-2,4-dinitrophenyloximes
Uchiyama, Katsuya
, p. 2945 - 2955 (2007/10/03)
Cyclization of 2-(3-hydroxyphenyl)ethyl ketone 0-2,4- dinitrophenyloximes proceeds on the oxime nitrogen atom by the treatment with NaH and then with 2,3-dichloro-5,6-dicyano-p-benzoquinone and acetic acid to yield quinolin-8-ols regioselectively. The reaction in the presence of Na[BH3(CN)] affords 1,2,3,4-tetrahydroquinolin-8-ols. The present cyclization proceeds via alkylideneaminyl radical intermediates generated by the single electron transfer between 3-hydroxyphenyl and 2,4-dinitrophenyl moieties.
Synthesis of 8-hydroxyquinolines by the cyclization of m-hydroxyphenethyl ketone O-2,4-dinitrophenyloximes
Uchiyama, Katsuya,Hayashi, Yujiro,Narasaka, Koichi
, p. 445 - 446 (2007/10/03)
8-Hydroxyquinolines are synthesized from O-2,4-dinitrophenyloximes of m-hydroxyphenethyl ketones by the treatment with sodium hydride, and then with 2,3-dichloro4,5-dicyano-p-benzoquinone (DDQ).
