Syntheses and biological evaluation of ring-C modified colchicine analogs
作者:Baiyuan Yang、Zhiqing C. Zhu、Holly V. Goodson、Marvin J. Miller
DOI:10.1016/j.bmcl.2010.03.056
日期:2010.6
Ring-C modified alkaloids were synthesized from colchicine using iminonitroso Diels–Alder reactions in a highly regio- and stereoselective fashion. Several analogs exhibited cytotoxic activity similar to that of colchicine itself against PC-3 and MCF-7 cancer cell lines, by serving as prodrugs of colchicine through retro Diels–Alder reactions under the assayed conditions. In vitro microtubule polymerization
使用亚氨基亚硝基 Diels-Alder 反应以高度区域和立体选择性的方式从秋水仙碱合成环 C 修饰的生物碱。几种类似物表现出类似于秋水仙碱本身对 PC-3 和 MCF-7 癌细胞系的细胞毒活性,通过在测定条件下通过逆狄尔斯-阿尔德反应作为秋水仙碱的前药。体外微管聚合试验表明这些修饰影响了它们与微管蛋白的相互作用。
Cyclization of substitued 2-(2-fluorophenylazo)azines to azino[1,2-<i>c</i>]benzo[<i>d</i>][1,2,4]triazinium derivatives
Light-induced cyclization of several substituted2-(2-fluorophenylazo)azines in the presence of Ca(2+) ions to the corresponding triazinium derivatives is investigated experimentally and computationally. The azo derivatives of 4-methylpyridine 4 undergo facile cyclization to the corresponding triazinium 1, and the rate of cyclization increases with increasing number of fluorine atoms at the benzene
N–O Chemistry for Antibiotics: Discovery of <i>N</i>-Alkyl-<i>N</i>-(pyridin-2-yl)hydroxylamine Scaffolds as Selective Antibacterial Agents Using Nitroso Diels–Alder and Ene Chemistry
作者:Timothy A. Wencewicz、Baiyuan Yang、James R. Rudloff、Allen G. Oliver、Marvin J. Miller
DOI:10.1021/jm200794r
日期:2011.10.13
The discovery, syntheses, and structure–activity relationships (SAR) of a new family of heterocyclic antibacterial compounds based on N-alkyl-N-(pyridin-2-yl)hydroxylamine scaffolds are described. A structurally diverse library of ∼100 heterocyclic molecules generated from Lewis acid-mediated nucleophilic ring-opening reactions with nitroso Diels–Alder cycloadducts and nitroso ene reactions with substituted
Unexpected Insertion of Nitrogen into a C–C Bond: Access to 2,3-Disubstituted Quinazolinone Scaffolds
作者:Hui-Li Liu、Xiao-Tong Li、Heng-Zhi Tian、Xing-Wen Sun
DOI:10.1021/acs.orglett.1c01235
日期:2021.6.18
A novel, practical, highly efficient, and transition metal free nitrogeninsertion reaction for the synthesis of 2,3-disubstituted quinazolinone derivatives was developed. Diverse functionalized 3-indolinone-2-carboxylates and nitrosoarenes with a wide range of substituted nitrosobenzenes, nitrosopyridines, dibenzofuranyl, or dibenzothienyl nitroso compounds worked smoothly to give 2,3-disubstituted
no]acetates with quaternary stereocenters and potential antibacterial activities were obtained in excellent yields with good to excellent ee values under as low as 0.05 mol % catalyst loading. The products could be easily transformed to useful α‐amino amides and 1,2‐diamines. Besides, a possible transition state model was proposed to elucidate the origin of the chirality induction.