Novel total syntheses of oxoaporphine alkaloids enabled by mild Cu-catalyzed tandem oxidation/aromatization of 1-Bn-DHIQs
作者:Bo Zheng、Hui-Ya Qu、Tian-Zhuo Meng、Xia Lu、Jie Zheng、Yun-Gang He、Qi-Qi Fan、Xiao-Xin Shi
DOI:10.1039/c8ra05338c
日期:——
Noveltotalsyntheses of oxoaporphine alkaloids such as liriodenine, dicentrinone, cassameridine, lysicamine, oxoglaucine and O-methylmoschatoline were developed. The key step of these totalsyntheses is Cu-catalyzed conversion of 1-benzyl-3,4-dihydro-isoquinolines (1-Bn-DHIQs) to 1-benzoyl-isoquinolines (1-Bz-IQs) via tandem oxidation/aromatization. This novel Cu-catalyzed conversion has been studied
Total Syntheses of Aporphine Alkaloids via Benzyne Chemistry: An Approach to the Formation of Aporphine Cores
作者:Allan F. C. Rossini、Ana Carolina A. Muraca、Gleison A. Casagrande、Cristiano Raminelli
DOI:10.1021/acs.joc.5b01634
日期:2015.10.16
Total syntheses of lysicamine, (±)-nuciferine, (±)-nornuciferine, (±)-zanthoxyphylline iodide, (±)-O-methylisothebaine, and (±)-trimethoxynoraporphine were accomplished by an approach that involves the formation of aporphine cores through reactions between an isoquinoline derivative and silylaryl triflates promoted by CsF. Unprecedented formations of aporphine cores proceeded in good yields presumably
Aryl Radical Cyclizations of 1-(2‘-Bromobenzyl)isoquinolines with AIBN−Bu<sub>3</sub>SnH: Formation of Aporphines and Indolo[2,1-<i>a</i>]isoquinolines
text] Radical cyclization of alkoxy-substituted 1-(2'-bromobenzyl)-3,4-dihydroisoquinolines 1 with AIBN-Bu3SnH gave 6a,7-dehydroaporphines 2 preferentially. A steric repulsion between the respective alkoxy groups at the 7- and 3'-positions gave 5,6-dihydroindolo[2,1-a]isoquinolines 3 in a "disfavored" 5-endo cyclization mode. Radical cyclizations of the related substrates, such as 1-(2'-bromobenzoyl)isoquinolines
Fremy's salt oxidation of some isoquinoline alkaloids. Biogenetic considerations
作者:Luis Castedo、Alberto Puga、José M. Saá、Rafael Suau
DOI:10.1016/s0040-4039(01)90506-4
日期:1981.1
Fremy'ssaltoxidation of benzyl isoquinoline and aporphine alkaloids to isoquinolones and oxoaporphines is described. Aminium radicals are suggested to account for the observed results. Their possible involvement in alkaloid biosynthesis is considered.
efficient one-pot reaction for the synthesis of oxoaporphine alkaloids has been developed. Twenty-three compounds of oxoaporphine alkaloids were prepared and assessed for their antitumor activities. Most compounds inhibited the growth of T-24 tumor cells in vitro. Particularly, 4B displayed the most potent activity with an IC50 value of 0.5 μM, which was 19-fold more potent than the parent compound 4. The
已经开发了一种用于合成氧代卟啉生物碱的有效一锅法反应。制备并评估了 23 种氧代卟啉生物碱化合物的抗肿瘤活性。大多数化合物在体外抑制 T-24 肿瘤细胞的生长。特别是,4B显示出最有效的活性,其 IC 50值为 0.5 μM,比母体化合物4强 19 倍。-NO 2在氧代卟啉核心的C3位取代显着增强了抗癌活性。机制研究表明,4和4B诱导细胞周期停滞在G2/M期;相比之下,4V诱导细胞周期停滞在 S 期。T-24细胞暴露于化合物4、4B和4V后观察到线粒体ROS/Ca 2+增加和MMP减少,并伴有caspase-3/9活化,提示线粒体途径参与诱导的细胞凋亡。此外,化合物4B在带有 T-24 的小鼠异种移植模型中有效抑制肿瘤生长。