For evaluating the effectiveness of organic synthesis, both intellectual property factor (IPF) and application potential factor (APF) are proposed. As a representative example, a highly effective synthetic method with IPF value of 53.8 and APF value of 100 has been established starting from indigo directing toward an antibiotic, 6-cyano-5-methoxy-12-methylindolo[2,3-a]carbazole, using only conventional reagents without using any protecting groups.
Short Step Syntheses of a Natural Product, 6-Cyano-5-methoxy-12-methylindolo[2,3-a]carbazole and Novel 6-Aminoindolo[2,3-a]thiazolo[5,4-c]carbazoles
Combined Directed <i>Ortho</i> and Remote Metalation−Cross-Coupling Strategies. General Method for Benzo[<i>a</i>]carbazoles and the Synthesis of an Unnamed Indolo[2,3-<i>a</i>]carbazole Alkaloid
作者:Xiongwei Cai、Victor Snieckus
DOI:10.1021/ol049780x
日期:2004.7.1
[reaction: see text] An efficient route to benzo[a]carbazoles via a metalation-cross-coupling sequence has been demonstrated and its application to the synthesis of the antitumor and antiviral alkaloid 6-cyano-5-methoxy-12-methylindolo[2,3-a]carbazole has been achieved.
Natural product leads for drug discovery: Isolation, synthesis and biological evaluation of 6-cyano-5-methoxyindolo[2,3-a]carbazole based ligands as antibacterial agents
作者:Songpo Guo、Suresh K. Tipparaju、Scott D. Pegan、Baojie Wan、Shunyan Mo、Jimmy Orjala、Andrew D. Mesecar、Scott G. Franzblau、Alan P. Kozikowski
DOI:10.1016/j.bmc.2009.08.061
日期:2009.10
Indolo[2,3-a]carbazole based inhibitors were synthesized from readily available indigo via a seven-step linear synthetic sequence with a moderate overall yield. The inhibitors were selectively and readily functionalized at the nitrogen on the indole portion of the carbazole unit. The synthesized analogs displayed moderate inhibitory activities toward Bacillus anthracis and Mycobacterium tuberculosis
Indolo[2,3- a ]咔唑类抑制剂是从容易获得的靛蓝中通过七步线性合成序列以中等总产率合成的。抑制剂在咔唑单元的吲哚部分上的氮上被选择性且容易地官能化。合成的类似物对炭疽芽孢杆菌和结核分枝杆菌显示出中等抑制活性,表明吲哚[2,3- a ]咔唑可作为开发新药对抗炭疽和结核病感染的有希望的线索。