Does the DABCO-catalysed reaction of 2-hydroxybenzaldehydes with methyl acrylate follow a Baylis–Hillman pathway?
作者:Perry T. Kaye、Musiliyu A. Musa、Xolani W. Nocanda、Ross S. Robinson
DOI:10.1039/b300360d
日期:2003.3.27
Evidence is presented which supports the intermediacy of dipolar Baylis-Hillman-type adducts in the synthesis of coumarin and chromene derivatives from the reaction of 2-hydroxybenzaldehydes with methyl acrylate in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO).
Towards the synthesis of coumarin derivatives as potential dual-action HIV-1 protease and reverse transcriptase inhibitors
作者:Temitope O. Olomola、Rosalyn Klein、Kevin A. Lobb、Yasien Sayed、Perry T. Kaye
DOI:10.1016/j.tetlet.2010.09.121
日期:2010.12
3-alkynylmethylcoumarins with azidothymidine (AZT) in the presence of a Cu(I) catalyst has afforded a series of cycloaddition products for evaluation, in their own right, as potential dual-action HIV-1 protease and non-nucleoside reversetranscriptaseinhibitors, and as scaffolds for further structural elaboration.
Elucidating Latent Mechanistic Complexity in Competing Acid-Catalyzed Reactions of Salicylaldehyde-Derived Baylis–Hillman Adducts
作者:Temitope O. Olomola、Rosalyn Klein、Mino R. Caira、Perry T. Kaye
DOI:10.1021/acs.joc.5b02372
日期:2016.1.4
1H NMR-based kinetic studies have revealed the latent mechanistic complexity of deceptively simple hydrochloric acid-catalyzed reactions of salicylaldehyde-derived Baylis–Hillman adducts. Reactions conducted at 0 °C afforded 2-(chloromethyl)cinnamic acid derivatives as the major products and the corresponding 3-(chloromethyl)coumarin derivatives as the minor products. In reactions conducted in refluxing
基于1 H NMR的动力学研究揭示了水杨醛衍生的Baylis-Hillman加合物的看似简单的盐酸催化反应的潜在机理复杂性。在0℃下进行反应,得到2-(氯甲基)肉桂酸衍生物为主要产物,相应的3-(氯甲基)香豆素衍生物为次要产物。然而,在回流乙酸中进行的反应中,3-(氯甲基)香豆素衍生物是唯一的产物。可变温度1 H NMR分析可以确定(Z的拟一级化学反应中涉及的速率常数和动力学参数)-2-(氯甲基)-3-(2-羟苯基)-2-丙酸。动力学数据清楚地排除了经典动力学与热力学控制的操作,并指出了三个独立反应途径的操作。在B3LYP / 6-31G(d)水平上对这些途径进行的理论研究允许合理化实验数据,并为酶E - Z异构化和(E)肉桂酸类似物环化提供香豆素的可能机理提供了见解。。
A Convenient and Improved Baylis-Hillman Synthesis of 3-Substituted 2<i>H</i>-1-benzopyran-2-ones
作者:Perry T. Kaye、Musiliyu A. Musa
DOI:10.1055/s-2002-35984
日期:——
Halogen acid-catalysed deprotection and cyclisation of Baylis-Hillman products obtained using O-benzylated salicylaldehyde precursors has been shown to afford 3-(halomethyl)coumarins (3-halomethyl-2H-1-benzopyran-2-ones) chemoselectively and in good yield.
Synthesis and evaluation of coumarin derivatives as potential dual-action HIV-1 protease and reverse transcriptase inhibitors
作者:Temitope O. Olomola、Rosalyn Klein、Nicodemus Mautsa、Yasien Sayed、Perry T. Kaye
DOI:10.1016/j.bmc.2013.01.025
日期:2013.4
propargylamine to afford alkynylated coumarins as substrates for Click Chemistry reactions with azidothymidine (AZT) in the presence of a Cu(I) catalyst. The dual-action HIV-1 protease (PR) and reversetranscriptase (RT) inhibition potential of the resulting N-benzylated cycloaddition products, and a series of non-benzylated analogues, has been explored using saturation transfer difference (STD) NMR, computer