Fe(ClO4)3·×H2O-Catalyzed direct C–C bond forming reactions between secondary benzylic alcohols with different types of nucleophiles
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1016/j.tet.2010.02.063
日期:2010.4
mild and efficient Fe(ClO4)3·×H2O-catalyzed direct C–C bond coupling reactions of 1,3-dicarbonyl compounds, electron-rich arenes and heteroarenes and 4-hydroxycoumarin with secondary benzylic alcohols have been described. The benzylation of electron-rich arenes and heteroarenes leads to the synthesis of bis-symmetrical triarylmethanes. The present method is also applied to synthesis of an anti-coagulant
Tungsten oxides: green and sustainable heterogeneous nanocatalysts for the synthesis of bioactive heterocyclic compounds
作者:T. A. J. Siddiqui、Shoyebmohamad F. Shaikh、Balaji B. Totawar、Madhuri Dumpala、Mohd Ubaidullah、Badr M. Thamer、Rajaram S. Mane、Abdullah M. Al-Enizi
DOI:10.1039/d0dt04238b
日期:——
Tungsten oxide (WO3) as an efficient heterogeneous catalyst was prepared via a simple hydrothermal route for the synthesis of a wide range of bioactive heterocycliccompounds. The present investigation deals with the rapid and low-cost synthesis of C-3-alkylated 4-hydroxycoumarin, chromene, and xanthene derivatives. WO3 nanorods (NRs) are successfully envisaged to catalyze desired transformations,
氧化钨 (WO 3 ) 作为一种高效的多相催化剂是通过简单的水热途径制备的,用于合成范围广泛的生物活性杂环化合物。本研究涉及C -3-烷基化 4-羟基香豆素、色烯和呫吨衍生物的快速和低成本合成。WO 3纳米棒(NRs)被成功设想为催化所需的转化,展示了它们在催化中的广泛潜在应用。阐明了合成转化细节、最小催化量、优异的产品产率和形成这些杂环支架的合理反应机制。制备的WO 3NRs 的特征是分别通过 X 射线衍射、X 射线光电子能谱和场发射扫描电子显微镜测量来确认它们的结构、化学和形态参数。我们讨论了控制产物形成的因素,以及 WO 3 NRs的积极作用,这对于当前热条件研究中的底物活化至关重要。在此,报告了所制备化合物的详细合成和光谱信息。
Direct Catalytic Benzylation of Hydroxycoumarin - Efficient Synthesis of Warfarin Derivatives and Analogues
作者:Magnus Rueping、Boris Nachtsheim、Erli Sugiono
DOI:10.1055/s-0029-1219936
日期:2010.6
Effective metal-catalyzed benzylations of 4-hydroxycoumarin have been developed. Employing a low amount of a cheap, nontoxic, and air-stable catalyst the 3-alkylated hydroxycoumarins were isolated in high yields after short reaction times. Applying this new methodology two widely used anticoagulants phenprocoumon and coumatetralyl were synthesized applying mild reaction conditions.
Ganguly, Nemai C.; Chandra, Sumanta, Journal of the Indian Chemical Society, 2012, vol. 89, # 4, p. 547 - 555
作者:Ganguly, Nemai C.、Chandra, Sumanta
DOI:——
日期:——
Molecular iodine-catalyzed C3-alkylation of 4-hydroxycoumarins with secondary benzyl alcohols
作者:Xufeng Lin、Xixiang Dai、Zhenjun Mao、Yanguang Wang
DOI:10.1016/j.tet.2009.09.007
日期:2009.11
A highly efficient method for the C-C bond formation via molecular iodine-catalyzed C3-alkylation reaction of 4-hydroxycoumarins with benzylic, benzhydrylic, allylic, and propargyl alcohols at 50 degrees C in MeNO2 is described. The 3-alkylated-4-hydroxycoumarins were obtained in good yields (up to 97%). By applying this reaction as the key step, a multi-substituted pyranocoumarin can easily be synthesized in a one-pot procedure. The advantages of this method are broad scope, mild conditions, and easy handling since water is the only side product. (C) 2009 Elsevier Ltd. All rights reserved.