tritylamines undergo an unprecedented copper‐mediated cyclization involving the cleavages of two CH bonds and one CNbond to give 9‐arylacridine derivatives. This kind of acridines is of interest due to their biological properties and their unique optical and electro‐ and photochemical properties. Some of obtained acridine derivatives exhibit intense fluorescence in the solid state.
New Reactions of (2-Aminophenyl)diphenylmethanol with Carbonyl Compounds
作者:E. V. Gromachevskaya、K. S. Pushkareva、A. V. Bespalov、V. D. Strelkov
DOI:10.1134/s1070428018080171
日期:2018.8
Reactions of (2-aminophenyl)diphenylmethanol with ketones (dimedone, camphor, and 3-bromocamphor) in acetic acid result in the formation of arylimines of camphore and 3-bromocamphore, substituted tetrahydroacridin-1(2H)-one and 2-methyl-4,4-diphenylbenzoxazine.
The treatment of o-(N-acylamino)benzyl alcohols (1) with DAST afforded the dehydrative cyclization product, 4H-3,1-benzoxazines (4) and the hydroxy replacement product, o-(N-acylamino)benzyl fluorides (5). The yields of benzoxazines (4) and fluorides (5) depend on the substituents at alpha-position and acyl groups. The treatment of alpha,alpha-diaryl-o-(N-acylamino)benzyl alcohols (1a-c) with DAST yielded benzoxazines (4a-c) exclusively, while that of alpha-monosubstituted o-(N-acylamino)benzyl alcohols (Id-k) with DAST yielded benzoxazines (4d-k) and fluorides (5d-k). In the reaction of o-(N-acylamino)benzyl alcohol (11) with DAST, the formation of fluoride (51) became predominant and that of benzoxazine (41) was suppressed almost completely.