Synthesis of polycyclic spiro-fused indolines via IBX-mediated cascade cyclization
作者:Zhiguo Zhang、Xiaoqing Song、Guofeng Li、Xiang Li、Dan Zheng、Xuna Zhao、Huanran Miao、Guisheng Zhang、Lantao Liu
DOI:10.1016/j.cclet.2020.11.001
日期:2021.4
We report a 2-iodoxybenzoic acid (IBX)-mediated intarmolecular oxidative spiro-fused tandem cyclization reaction of tryptophan analogs bearing an N-arylamides side-chain to rapidly afford polycyclic spiroindolines featuring multiple stereocenters including a quaternary stereocenters under mild reaction conditions. Among them, a novelty azaphosphol idine-containing spiroindoline compound is synthesized
Synthesis and antibacterial in vitro activity of novel analogues of nematophin
作者:Thomas Himmler、Franz Pirro、Norbert Schmeer
DOI:10.1016/s0960-894x(98)00358-8
日期:1998.8
The synthesis and in vitro antibacterial activity of new derivatives and analogues of nematophin are described. It was shown that the unsubstituted amide NH-group is essential for bioactivity. Alkyl- or aryl-substitution at the 1-position results in a distinct increase of antibacterial activity. Addition of protein (blood or serum) to the culture media reduces the inhibitory activity on bacteria. (C) 1998 Elsevier Science Ltd. All rights reserved.
An efficient and rapid protocol for the oxidative halogenation of tryptamines with 10% aqueous NaClO has been developed. This reaction is featured by its operational simplicity, metal‐free conditions, no purification, and high yield. Notably, the resulting key intermediates are suitable for further functionalization with various nucleophiles, including amines, N‐aromatic heterocycles, indoles and phenols. The overall transformation exhibits broad functional‐group tolerance and is applicable to the late‐stage functionalization of complex biorelevant molecules.