Design and synthesis of 3,5-disubstituted boron-containing 1,2,4-oxadiazoles as potential combretastatin A-4 (CA-4) analogs
摘要:
We have designed and synthesized a small library of 3,5-disubstituted-1,2,4-oxadiazole containing combretastatin A-4 (CA-4) analogs. Our objective is to increase the efficacy of the CA-4 as an anti-tubulin and antimitotic agent by substituting the cis-alkene bond with one of its bioisosteres, the 1,2,4-oxadiazole ring. We also modified the substituents attached to both of the phenyl rings (ring A and B in Fig. 1) of CA-4 for the purpose of diversifying our analogs based on SAR. These compounds were synthesized via a coupling reaction between an amidoxime and a carboxylic acid in DMF solvent, with HOBt as a base, and utilizing EDCI as a coupling reagent. Using this protocol, we synthesized a small library of 10 compounds with moderate to good yields. A detailed biological study is currently undergoing in our laboratory to evaluate the activity of these compounds. (C) 2012 Elsevier Ltd. All rights reserved.
A Mild, Facile Method for the Preparation of Amino-esters
作者:Paul Albert Stadler、Bruno Silvio Huegi
DOI:10.1002/hlca.19850680618
日期:1985.9.25
Lithium alcoholates prepared in situ react spontaneously with imidazolides derived from substituted aromatic carboxylic acids to provide the amino-esters 4 in excellent yield.
原位制备的醇锂与自取代的芳族羧酸衍生的咪唑化物自发反应,以优异的产率提供氨基酯4。
Simple synthesis of biphenyls with the 2-carbomethoxy-3,5-dihydroxyphenyl moiety
作者:D. Stossel、T. H. Chan
DOI:10.1021/jo00386a042
日期:1987.5
STADLER, P. A.;HUEGI, B. S., HELV. CHIM. ACTA, 1985, 68, N , 1644-1646
作者:STADLER, P. A.、HUEGI, B. S.
DOI:——
日期:——
STOSSEL D.; CHAN T. H., J. ORG. CHEM., 52,(1987) N 10, 2105-2106
作者:STOSSEL D.、 CHAN T. H.
DOI:——
日期:——
Chemoselective acylation of 2-amino-8-quinolinol in the generation of C2-amides or C8-esters
作者:Yongseok Park、Xiang Fei、Yue Yuan、Sanha Lee、Joonseong Hur、Sung Jean Park、Jae-Kyung Jung、Seung-Yong Seo
DOI:10.1039/c7ra05287a
日期:——
Two different ways to carry out the chemoselectiveacylation of 2-amino-8-quinolinol with unique features to generate C2-amides or C8-esters were developed. The coupling reaction with a variety of carboxylic acids using EDCI and DMAP provided C8-ester derivatives, whereas N-heteroaromatic acids were not introduced on the C8-hydroxy group, but rather on the C2-amino group under the same conditions.