Facile Synthesis of Silylated 4,5-Disubstituted Phthalates via Inverse Electron-demand Cycloaddition of 2-Pyrone-4,5-dicarboxylate with Silylacetylenes
and efficient synthesis of silylated 4,5-disubstituted phthalates through the inverse electron-demand [4+2] cycloaddition of 2-pyrone-4,5-dicarboxylate with various silylacetylenes has been developed. The reaction was promoted by 4A molecular sieves (MS 4A) to afford the corresponding polysubstituted arenes with functionalizable silyl groups in good to highyield, thus providing versatile access to a
Development of benzothiazole ‘click-on’ fluorogenic dyes
作者:Jianjun Qi、Ching-Hsuan Tung
DOI:10.1016/j.bmcl.2010.11.009
日期:2011.1
'Click-on' fluorogenic reaction: a non-fluorescent benzothiazole with an electron-deficient alkyne group at 2-position reacts with azide containing molecules could form fluorescent adducts. (C) 2010 Elsevier Ltd. All rights reserved.
Nine 5-aryl-2-methyloxazole derivatives were synthesized via gold-catalyzed alkyne oxidation. All of the compounds have been screened for their antiproliferative activities against MCF-7 cell (human breast carcinoma), A549 cell (human lung carcinoma) and Hela cell (human cervical carcinoma) lines in vitro. The results revealed that compounds 1b, 1c and 1d exhibited strong inhibitory activities against the MCF-7 cell lines (with IC50 values of 4.6, 9.7 and 2.2 mu mol/L, respectively). (C) 2013 Wei-Min He and Jian-Nan Xiang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Silica Supported Fluoroboric Acid: An Efficient and Reusable Heterogeneous Catalyst for Facile Synthesis of 2-Aliphatic Benzothiazoles, Benzoxazoles, Benzimidazoles and Imidazo[4,5-b]pyridines
作者:Abasaheb V. Patil、Babasaheb P. Bandgar、Soo-Hyoung Lee
DOI:10.5012/bkcs.2010.31.6.1719
日期:2010.6.20
N-propargyl-2-alkynylbenzothiazolium aza-enediynes: role of the 2-alkynylbenzothiazolium functionality in DNA cleavage
作者:Dalip Kumar、Wendi M David、Sean M Kerwin
DOI:10.1016/s0960-894x(01)00606-0
日期:2001.11
The 2-alkynylbenzothiazolium salts 3a-d incorporating an N-propargyl moiety have been prepared as aza-enediyne analogues. While these aza-enediynes are shown to be modest DNA cleavage agents, DNA cleavage was also observed with the N-methyl-2-alkynylbenzothiazolium salt 4, which lacks the aza-enediyne moiety. The structural requirements for DNA cleavage, and the correlation of DNA cleavage efficiency with the propensity of these compounds to undergo nucleophilic addition by methanol support a proposed DNA cleavage mechanism involving DNA alkylation. by appropriate 2-alkynyl-substituted benzothiazolium salts. (C) 2001 Elsevier Science Ltd. All rights reserved.