halogen (Cl, Br, and even I), aldehyde, ketone, carboxyl, and cyano. Moreover, the photoredox catalysis with NaI and stoichiometric PPh3 provides also an alternative entry to Cadogan-type reductive amination when o-nitrobiarenes were used.
Solvent-free synthesis of δ-carbolines/carbazoles from 3-nitro-2-phenylpyridines/2-nitrobiphenyl derivatives using DPPE as a reducing agent
作者:Haixia Peng、Xuxing Chen、Yanhong Chen、Qian He、Yuyuan Xie、Chunhao Yang
DOI:10.1016/j.tet.2011.06.027
日期:2011.8
A green and efficient preparation of functionalized delta-carbolines/carbazoles via reductive ring closure by 1,2-bis(dipenylphosphino)ethane under solvent-free conditions is described. The starting materials 3-nitro-2-phenylpyridines/2-nitrobiphenyl derivatives are readily prepared through Suzuki-Miyaura cross-coupling reaction from commercially available compounds. And the polar by-product ethane-1,2-diylbis(diphenylphosphine oxide) is easily removed from the relatively polar reaction mixture. Various substituted delta-carbolines/carbazoles are obtained in acceptable yields. It is particularly worth mentioning that substrates with electron-withdrawing groups (EWG) also give the desired products in good yield. (C) 2011 Elsevier Ltd. All rights reserved.
Structure–Activity Relationships of Carboline and Carbazole Derivatives as a Novel Class of ATP-Competitive Kinesin Spindle Protein Inhibitors
The kinesin spindle protein (KSP) is a mitotic kinesin involved in the establishment of a functional bipolar mitotic spindle during cell division. It is considered to be an attractive target for cancer chemotherapy with reduced side effects. Based on natural product scaffold-derived fused indole-based inhibitors and known biphenyl-type KSP inhibitors, various carboline and carbazole derivatives were synthesized and biologically evaluated. beta-Carboline and lactam-fused carbazole derivatives exhibited remarkably potent KSP inhibitory activity and mitotic arrest in prometaphase with formation of an irregular monopolar spindle. The planar tri- and tetracyclic analogs inhibited KSP ATPase in an ATP-competitive manner just like biphenyl-type inhibitors.
endergonic formation of the intermediate complex of nitrobiarenes and PPh3, which corresponds with experimental findings regarding reactiontemperature. The robust synthetic capacity of the photoredox Cadogan reaction systems has been demonstrated by the viable productivity of a broad range of carbazoles and related N-heterocycles with good tolerance of various functionalities.
已发现可见光驱动的光化学卡多根型环化。发现有机 DA 型光敏剂 4CzIPN 是将能量从光子转移到瞬态中间体的有效介质,该中间体打破了卡多根反应中的脱氧壁垒,并使无温和金属的咔唑和相关杂环成为可能。DFT 计算结果表明硝基双芳烃和 PPh 3的中间体复合物的温和吸能形成,这与关于反应温度的实验结果一致。光氧化还原 Cadogan 反应系统的强大合成能力已通过广泛范围的咔唑和相关N-杂环的可行生产力得到证明,这些N-杂环对各种官能团具有良好的耐受性。