A totalsynthesis strategy was developed for the synthesis of luotonin A, B and their analogues using synergistic FeCl3/KI-catalyzed oxidative cyclization. This protocol utilizes cheap and widely available N-propargyl 2-methyl-quinazolinones and arylamines under mild conditions, and it has a wide substrate scope and high atom economy. Different natural products (luotonin A, B and derivatives) can be
Synthesis and topoisomerase poisoning activity of A-ring and E-ring substituted luotonin A derivatives
作者:Kassoum Nacro、Conxiang (Charles) Zha、Peter R. Guzzo、R. Jason Herr、Denise Peace、Thomas D. Friedrich
DOI:10.1016/j.bmc.2007.03.067
日期:2007.6
A series of A-ring and E-ring analogues of the natural product luotonin A, a known topoisomerase I poison, was evaluated for growth inhibition in human carcinoma and leukemia cell lines. Rational design of structures was based on analogues of the related alkaloid camptothecin, which has been demonstrated to exert cytotoxic effects by the same mechanism of action. When compared to luotonin A, several compounds exhibited an improved topoisomerase I-dependent growth inhibition of a human leukemia cell line. (C) 2007 Elsevier Ltd. All rights reserved.
Starting with inexpensive reagents, a self-directed chemical process with the aid of a single metal triflate was readily achieved to concomitantly construct quinazoline and pyrroloquinoline cores to afford the synthesis of luotonin A and its analogues. Among all compounds prepared, 2c, 2d, and 3b exhibit more potent inhibitory activity than luotonin A against human topoisomerase I.
Palladium-Catalyzed Sequential Cyanation/N-Addition/N-Arylation in One-Pot: Efficient Synthesis of Luotonin A and Its Derivatives
作者:Yi Ju、Feng Liu、Chaozhong Li
DOI:10.1021/ol901305q
日期:2009.8.20
With the catalysis of palladium, a number of 2-bromo-N-(2-iodobenzyl)benzamides underwent sequential cyanation/N-addition/N-arylation leading to the efficient construction of isoindolo[1,2-b]quinazolin-10(12H)-ones in a two-stage, one-pot manner. This method also allowed the convenient synthesis of luotonin A and its derivatives.