Condensations of Aromatic Amines with Formaldehyde in Media Containing Acid. V. Substituted Dihydroquinazolines from p-Chloroaniline and p-Bromoaniline
3,5- and 3,6-disubstituted 3,4-dihydroquinazolines
作者:L. P. Yunnikova、V. V. Esenbaeva
DOI:10.1134/s1070363216070392
日期:2016.7
It has previously been shown that the reactions of para-substituted anilines with formaldehyde in the presence of hydrochloric [1–3] or oxalic acid [4] lead to the formation of 6(4’)-substituted 3,4-dihydroquinazolines (11–38%). When replacing formaldehyde with another source of methylene group, metoxychloromethane, the reaction with arylamines afforded both 3,4-dihydroquinazolines (25%) and 1,2,3
Oxidative debenzylation of N-benzyl aromatic amines using DMSO as a non-toxic oxidant and catalyzed by TsOH gave N-phenylimines, which were spontaneously hydrolyzed to form anilines and benzaldehydes in good yields. This reaction employs mild, metal-free conditions. The conditions are also suitable for the debenzylation of benzylphenylethers.
CONDENSATIONS OF AROMATIC AMINES WITH FORMALDEHYDE IN MEDIA CONTAINING ACID. VI. THE USE OF FORMIC ACID IN THE PREPARATION OF 3,6-DISUBSTITUTED DIHYDROQUINAZOLINES FROM PARA-SUBSTITUTED AMINES, AND FROM THEIR BIS(ARYLAMINO)-METHANES AND SCHIFF BASES
作者:E. C. WAGNER
DOI:10.1021/jo01225a003
日期:1937.5
Some Analogs of Troeger's Base and Related Compounds<sup>1</sup>
作者:T. R. Miller、E. C. Wagner
DOI:10.1021/ja01848a055
日期:1941.3
Cairncross; Bogert, Collection of Czechoslovak Chemical Communications, 1935, vol. 7, p. 548,550, 553