Design, synthesis, and anti-tumor activity of (2-O-alkyloxime-3-phenyl)-propionyl-1-O-acetylbritannilactone esters
摘要:
The extracts of Inula britannica have anti-inflammatory, anti-bacterial, anti-hepatitic, and anti-tumor activities. Various sesquiterpene lactones with cytotoxic properties including 1-O-acetylbritannilactone (1) have been isolated from this Chinese medicinal plant. Eight derivatives of 1-O-acetylbritannilactone, (2-O-alkyloxime-3-phenyl)-propionyt-1-O-acetylbritannilactone esters were designed and synthesized. Four of these compounds were tested to show inhibitory activity on the growth of human leukemia HL-60 and cancer Bel-7402 cell lines. (c) 2005 Elsevier Ltd. All rights reserved.
Convenient Method for Reduction of C-N Double Bonds in Oximes, Imines, and Hydrazones Using Sodium Borohydride–Raney Ni System
作者:Yihua Yang、Shouxin Liu、Junzhang Li、Xia Tian、Xiaoli Zhen、Jianrong Han
DOI:10.1080/00397911.2011.562063
日期:2012.9
Abstract A practical method has been developed for reduction of C-N double bond in oximes, imines, and hydrazones with sodium borohydride catalyzed by Raney Ni. The reactions were carried out in basic aqueous solution, and the desired products were obtained in moderate yields after a simple procedure. This method can be applied to synthesize simpler aliphatic or aromatic amines and its analogs. GRAPHICAL
摘要 开发了一种在 Raney Ni 催化下用硼氢化钠还原肟、亚胺和腙中 CN 双键的实用方法。反应在碱性水溶液中进行,经过简单的程序,以中等收率得到所需产物。该方法可用于合成更简单的脂肪族或芳香族胺及其类似物。图形概要
Unnatural α-amino ethyl esters from diethyl malonate or ethyl β-bromo-α-hydroxyiminocarboxylate
作者:Eloi P Coutant、Vincent Hervin、Glwadys Gagnot、Candice Ford、Racha Baatallah、Yves L Janin
DOI:10.3762/bjoc.14.264
日期:——
We have explored here the scope of the age-old diethyl malonate-based accesses to α-aminoesters involving Knoevenagel condensations of diethyl malonate on aldehydes, reductions of the resulting alkylidenemalonates, the preparation of the corresponding α-hydroxyimino esters and their final reduction. This synthetic pathway turned out to be general although some unexpected limitations were encountered
Synthesis and activity evaluation of the cyclic dipeptides arylidene N -alkoxydiketopiperazines
作者:Xia Tian、Juan Feng、Shi-ming Fan、Xiao-li zhen、Jian-rong Han、Shou-xin Liu
DOI:10.1016/j.bmc.2016.08.038
日期:2016.11
intramolecular acylation. Possible cyclization and acid-catalyzed rearrangement-fragmentation mechanisms were discussed. The crystal structure of the novel diketopiperazine further confirmed the rearrangement mechanism. Most compounds exhibited antitumor activity. Several compounds were more potent against caspase-3. Specifically, compounds 6e, 6g, and 6f inhibited caspase-3 at IC50 values lying within the
Oximes of α-keto esters are reduced to obtain the corresponding amino alcohols using NaBH4 in combination with I2, CH3COOH, TiCl4, ZrCl4, COCl2, H2SO4, and TMS-Cl in 60-85% yields. The racemic phenylglycinol, phenylalaninol, and 2-aminobutanol are resolved using dibenzoyl-l-tartaric acid to obtain enantiomeric samples of >98% ee.