NMR spectral and structural studies on some xanthenones and their thiosemicarbazone derivatives: Crystal and molecular structure of 12-(2-chlorophenyl)-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one
摘要:
A series of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-ones [1a-9a] were prepared employing a three component one-pot reaction of aryl aldehyde, 2-naphthol and 1,3-cyclohexanedione using BF3 center dot OEt2 as catalyst. Thiosemicarbazone derivatives [1b-5b] were also prepared in the presence of acid catalyst. All the synthesized compounds have been characterized by IR and NMR. The structure of 5b was confirmed by HSQC spectral analysis. Single crystal X-ray structural analysis of 12-(2-chloropheny1)8,9,10,12-tetrahydrobenzo[a]xanthen-11-one evidences the envelope and flattened-boat conformations of cyclohexenone and pyran rings respectively. (C) 2011 Elsevier B.V. All rights reserved.
Sulfonation of carbonized xylan-type hemicellulose: a renewable and effective biomass-based biocatalyst for the synthesis of O- and N-heterocycles
作者:Jiliang Ma、Xinwen Peng、Linxin Zhong、Runcang Sun
DOI:10.1039/c8nj01329b
日期:——
application of biomass-based carbonaceous solidacids in catalysis is attracting increasing attention in the field of chemistry. In this study, a heterogeneous carbon-based solidacid biocatalyst (CXH-SO3H) with regular spherical structure was synthesized from xylan-type hemicellulose (XH) by a simple two-step method. The catalyst was successfully applied in the synthesis of O- and N-heterocycles with yields
A magnetic nanoparticle supported dual acidic ionic liquid: a “quasi-homogeneous” catalyst for the one-pot synthesis of benzoxanthenes
作者:Qiang Zhang、Hong Su、Jun Luo、Yunyang Wei
DOI:10.1039/c1gc16031a
日期:——
A novel magneticnanoparticle supported dual acidic ionic liquid catalyst was synthesized by anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto the surface of silica-coated Fe3O4 nanoparticles. Due to the combination of nano-support features and flexible imidazolium linkers, it acted as a “quasi-homogeneous” catalyst to effectively catalyze the one-pot synthesis of
One-Pot, Three-Component Condensation of Aldehydes, 2-Naphthol and 1,3-Dicarbonyl Compounds
作者:Li-Ping Mo、Hong-Li Chen
DOI:10.1002/jccs.201000025
日期:2010.4
A practical and efficient procedure for the one‐pot multicomponent couping of aryl aldehydes, 2‐naphthol and cyclic 1,3‐dicarbonyl compounds using perchloric acid adsorbed on silica gel (HClO4‐SiO2) as a highly efficient, inexpensive, convenient, reusable heterogeneous catalyst under solvent‐free conditions has been developed. Various biologically important 12‐aryl‐8,9,10,12‐tetrahydrobenzo[a]xanthen‐11‐one
一种实用高效的方法,可通过吸附在硅胶上的高氯酸(HClO 4 -SiO 2)作为芳烃醛,2-萘酚和环状1,3-二羰基化合物的单锅多组分偶合,高效,廉价,方便,已开发出在无溶剂条件下可重复使用的多相催化剂。各种具有生物学重要意义的12-芳基-8,9,10,12-四氢苯并[ a ]黄嘌呤-11-one衍生物均已高效合成,收率很高。本方法具有许多优点,例如反应时间短,后处理简单,产率高,成本低以及反应条件温和。此外,该催化剂可以简单地回收和再利用而不会明显损失其催化活性。
Triphenylphosphine-m-sulfonate/carbon tetrabromide as an easily recoverable catalyst system for the efficient synthesis of xanthene and xanthenone derivatives under solvent-free conditions
作者:Cong-De Huo、Xia-Zhen Bao、Dong-Cheng Hu、Xiao-Dong Jia、Chou-Gu Sun、Cheng Wang
DOI:10.1016/j.cclet.2014.01.023
日期:2014.5
Abstract A solid complex, readily prepared from commercially available sodium triphenylphosphine- m -sulfonate (TPPMS) and carbontetrabromide, can be used as an easilyrecoverable and reusable catalyst system for one-pot condensation of 2-naphthol with aldehydes to construct 14-aryl(alkyl)-14 H -dibenzo[ a , j ]xanthene derivatives and one-pot condensation of 2-naphthol with aldehydes and cyclic 1
Water mediated reactions: TiO<sub>2</sub>and ZnO nanoparticle catalyzed multi component domino reaction in the synthesis of tetrahydroacridinediones, acridindiones, xanthenones and xanthenes
Tetrahydroacridine-1,8-(2H,5H,9H,10H)-diones4from 1,3-cyclohexanedione and/or dimedone 1,2-chloro-3-formylquinoline2and anilines3in water at 90 °C were obtained by domino reaction approach.