Haloenol pyranones and morpholinones as antineoplastic agents of prostate cancer
摘要:
Haloenol pyran-2-ones and morpholin-2-ones were synthesized and evaluated as inhibitors of cell growth in two different prostate human cancer cell lines (PC-3 and LNCaP). Analogs derived from Land D-phenylglycine were found to be the most effective antagonists of LNCaP and PC-3 cell growth. Additional studies reveal that the inhibitors induced G2/M arrest and the (S)-enantiomer of the phenylglycine-based derivatives was a more potent inhibitor of cytosolic iPLA(2)beta. Published by Elsevier Ltd.
Synthesis of Enol Lactones via Cu(I)-Catalyzed Intramolecular O-Vinylation of Carboxylic Acids
作者:Changhui Sun、Yewen Fang、Shuang Li、Yue Zhang、Qiwu Zhao、Shana Zhu、Chaozhong Li
DOI:10.1021/ol9015578
日期:2009.9.17
catalysis of CuI/trans-N,N′-dimethylcyclohexane-1,2-diamine, a number of carboxylic acids underwent efficient intramolecular O-vinylation with vinyl bromides leading to the synthesis of the corresponding five- and six-membered enollactones. The same catalytic system also led to the efficient cycloisomerization of alkynoic acids.
Silver-Catalyzed Decarboxylative Chlorination of Aliphatic Carboxylic Acids
作者:Zhentao Wang、Lin Zhu、Feng Yin、Zhongquan Su、Zhaodong Li、Chaozhong Li
DOI:10.1021/ja210361z
日期:2012.3.7
reaction conditions, or limited scope of application. In addition, none is catalytic for aliphaticcarboxylicacids. In this Article, we report the first catalytic Hunsdiecker reaction of aliphaticcarboxylicacids. Thus, with the catalysis of Ag(Phen)(2)OTf, the reactions of carboxylicacids with t-butyl hypochlorite afforded the corresponding chlorodecarboxylation products in high yields under mild conditions
Resolution and determination of the absolute stereochemistry of .alpha.- and .beta.-aryl-substituted .gamma.-methylenevalerolactones, alternate substrate inhibitors for serine proteases
作者:Du Jong Baek、Scott B. Daniels、Peter E. Reed、John A. Katzenellenbogen
DOI:10.1021/jo00277a040
日期:1989.8
Stereoselective Z- and E-bromoenol lactonization of alkynoic acids
作者:Wei Dai、John A. Katzenellenbogen
DOI:10.1021/jo00024a035
日期:1991.11
We have found that treatment of the silver salt of a 4- or 5-terminal alkynoic acid with bromine results in clean formation of the corresponding Z-bromo enol lactone, the result of a formal cis addition of carboxylate and bromine across the triple bond. This Z-bromo enol lactonization is highly stereoselective and gives good yields in systems that bear substituents on the internal methylene groups; yields with unsubstituted or terminally substituted alkynoic acids are modest. The E-bromo enol lactonization reaction, reported by us previously (Krafft, G. A.; Katzenellenbogen, J. A. J. Am. Chem. Soc. 1981, 103, 5459), has a broader scope and, with modifications, can be performed with high reliability. Mercury(II) salts equilibrate the Z- and E-bromo enol lactones, presumedly by a mercuric ion addition-elimination mechanism. These three reactions provide access to an array of stereoisomeric bromo enol lactone systems.