Selective Monoesterification of Malonic Acid Catalyzed by Boric Acid
作者:Stephan M. Levonis、Laurent F. Bornaghi、Todd A. Houston
DOI:10.1071/ch07231
日期:——
Boricacidcatalyzes the monoesterification of malonic acid, likely through a chelation mechanism that is not available to the monoester product. Under more forcing conditions, diesters form to some extent, but conditions can be optimized to favour the monoester product (56–80%). With the easily handled solid acid catalyst, these reactions can be run with excess alcohol as solvent or with stoichiometric
Decarboxylative (4+1) Oxidative Annulation of Malonate Monoesters with 2-Vinylpyridine Derivatives
作者:Shan Tang、Xinlong Gao、Aiwen Lei
DOI:10.1002/adsc.201600506
日期:2016.9.15
A novel N‐iodosuccinimide‐mediated decarboxylative (4+1) oxidative annulation between 2‐vinylpyridine derivatives and malonate monoesters was developed. It offers a new way to construct indolizine derivatives by utilizing malonate monoesters as a C1 unit. The alkyl 2,2‐diiodoacetate was found to be the active reaction intermediate during the transformation.
Synthesis of trans-caffeate analogues and their bioactivities against HIV-1 integrase and cancer cell lines
作者:Chun-nian Xia、Hai-bo Li、Feng liu、Wei-xiao Hu
DOI:10.1016/j.bmcl.2008.10.046
日期:2008.12
Forty caffeate analogues were synthesized via a convenient method starting from vanillin with moderate to good yields. The testing of biological activity of these compounds against HIV-1 integrase indicates that four compounds: bornyl caffeate, bornyl 2-nitrocaffeate, 5-nitrocaffeic acid and 5-nitrocaffeic acid phenethyl ester (5-nitroCAPE) possess a good HIV integrase inhibitory activity, IC50 19.9, 26.8, 25.0 and 13.5 mu M, respectively. Twelve caffeate analogues were tested by MTT assay on growth of human hepatocellular carcinoma BEL-7404, human breast MCF-7 adenocarcinoma, human lung A549 adenocarcinoma and human gastric cancer BCG823 cell lines, respectively. And the best result is IC50 5.5 mu M for CAPE against BEL-7404. (C) 2008 Elsevier Ltd. All rights reserved.
Synthesis and antitumor activity of feruloyl and caffeoyl derivatives
We developed two efficient protocols for the synthesis of feruloyl and caffeoyl derivatives from commercial vanillin and veratraldehyde. Pharmacological activities were assessed against a panel of human cancer cell lines in vitro. Most synthesized compounds demonstrated attractive cytotoxicity. Several new compounds demonstrated significant antiproliferative and cytotoxic activities against HeLa and Bewo tumor cell lines. In particular, 5-nitro caffeic adamantyl ester showed broad spectrum of tumor inhibition in 10 cell lines, and reduced tumor weight by 36.7% in vivo when administered at a dose of 40 mg kg(-1). (C) 2014 Elsevier Ltd. All rights reserved.