A novel and efficient route for the synthesis of new benzo[b]acridones has been described. It involves the Diels-Alder reaction of N-substituted-4-quinolone-3-carbaldehyde with ortho-benzoquinodimethanes giving benzo[b]-1,6,6a,12a-tetrahydroacridones, which are the result of a cycloaddition reaction followed by an in situ deformylation. The oxidation of these tetrahydroacridones in dimethyl sulfoxide using a catalytic amount of iodine gives the new benzo[b]acridone derivatives. It was demonstrated that the cycloaddition reaction is only efficient if an electron-withdrawing N-protecting group is present.
本研究描述了合成新苯并[b]吖啶酮的新颖而高效的路线。该方法涉及 N-取代-4-喹啉酮-3-甲醛与邻苯醌二甲烷的 Diels-Alder 反应,通过环加成反应和原位变形反应生成苯并[b]-1,6,6a,12a-四氢吖啶酮。使用一定量的碘催化这些四氢吖啶酮在二甲基亚砜中的氧化反应,可以得到新的苯并[b]吖啶酮衍生物。实验证明,只有当存在一个电子撤回的 N 保护基团时,环化反应才会有效。
527. Addition reactions of heterocyclic compounds. Part III. 2 : 3-Benzacridine and some dienophils
作者:R. M. Acheson、C. W. Jefford
DOI:10.1039/jr9560002676
日期:——
Tinnemans, A. H. A.; Ouden, B. den; Bos, H. J. T., Recueil des Travaux Chimiques des Pays-Bas, 1985, vol. 104, p. 109 - 116
作者:Tinnemans, A. H. A.、Ouden, B. den、Bos, H. J. T.、Mackor, A.
DOI:——
日期:——
US7611909B1
申请人:——
公开号:US7611909B1
公开(公告)日:2009-11-03
Synthesis of 10-Methylacridin-9(10<i>H</i>)-ones through Cu-Catalyzed Intramolecular Oxidative C(sp<sup>2</sup>)-H Amination of 2-(Methylamino)benzophenones
An efficient synthesis of a diverse set of 10-methylacridin-9(10H)-ones from 2-(methylamino)benzophenones has been developed. The reaction proceeds though Cu-catalyzed intramolecular aromatic C–H amination by using O2 as the sole oxidant to provide the desired products in moderate to good yields. In addition, 2-allylamino- and 2-(benzylamino)benzophenones as well as unprotected substrates can also