We developed a copper-catalyzed tandem reaction of 2-aminobenzamides with tertiary amines for the formation of quinazolinone derivatives. The strategy includes two steps (cyclization and coupling) performed in one pot. A number of substrates reacted well under standard conditions to give the corresponding quinazolinone derivatives in moderate to good yields.
NMR analysis of restricted internal rotation in 2-substituted-2,3-dihydro-3-<i>o</i>-tolyl(chlorophenyl)-4(1<i>H</i>)-quinazolinones
作者:Renato Noto、Michelangelo Gruttadauria、Paolo Lo Meo、Andrea Pace
DOI:10.1002/jhet.5570330412
日期:1996.7
in 2-substituted-2,3-dihydro-3-o-tolyl(chlorophenyl)-4(1H)-quinazolinones 1a-j produce sufficient restriction to rotation about the aryl CN bond that the presence of torsional isomers may be detected at room temperature. Diastereomeric population and free energy of activation for rotation have been calculated by 1H nmr spectra. Probably due to a preferred axial position of R2 substituent no dramatic
2-取代-2,3-二氢-3-邻甲苯基(氯苯基)-4(1 H)-喹唑啉酮1a-j中的芳基与杂环部分之间的立体相互作用产生了对绕芳基C N键旋转的充分限制在室温下可以检测到扭转异构体的存在。非对映异构体的数量和旋转激活的自由能已通过1 H nmr光谱进行了计算。可能由于R 2取代基的优选轴向位置,对于1a-f而言,未观察到A / B比和ΔG≠值的显着变化。1a和1j的比较ΔG ≠ 值允许对过渡态的结构提出假设。
CHATTEN, LESLIE G.;MOSKALYK, RICHARD E.;CHIN, ANDY;ZUMAN, PETR, ANAL. CHIM. ACTA, 200,(1987) N 1, 281-290
作者:CHATTEN, LESLIE G.、MOSKALYK, RICHARD E.、CHIN, ANDY、ZUMAN, PETR
DOI:——
日期:——
Deep eutectic solvent mediated synthesis of quinazolinones and dihydroquinazolinones: synthesis of natural products and drugs
作者:Suman Kr Ghosh、Rajagopal Nagarajan
DOI:10.1039/c6ra00855k
日期:——
A mild and greener protocol was developed to synthesize substituted quinazolinones and dihydroquinazolinonesviadeep eutectic solvent mediated cyclization with aliphatic, aromatic, and heteroaromatic aldehydes in good to excellent yields.