Phosphoric acid supported on alumina (H3PO4/Al2O3) is an efficient catalyst for the catalytic multi-component condensation reaction and a wide variety of syntheses of benzoxanthene pigments in good yields. The remarkable features of this new procedure are high conversions, shorter reaction times, cleaner reaction, and simple experimental and work-up procedures.
A truly green, solventless, and fast protocol for the quantitative preparation of biologically active xanthene derivatives with 10 mol% sulfonated graphitic carbon nitride (Sg─CN) as a heterogeneous acidic catalyst was developed. Excellent yields, low cost, solvent-free conditions, high catalytic activity, reusability of the catalyst, simple workup, and heterogeneous carbon-based catalyst make the
N-Sulfonic acid poly(4-vinylpyridinium) hydrogen sulfate as an efficient and reusable solid acid catalyst for one-pot synthesis of xanthene derivatives in dry media under ultrasound irradiation
作者:Nader Ghaffari Khaligh、Farhad Shirini
DOI:10.1016/j.ultsonch.2014.06.020
日期:2015.1
N-Sulfonic acid poly(4-vinylpyridinium) hydrogen sulfate catalyzed efficiently the synthesis of xanthene derivatives under ultrasonic irradiation at room temperature, which has prompted various concerns involving cost and environmental persistence. This methodology shows the effect of presence of anion hydrogen sulfate as an important and effective factor on the promotion of the one-pot multi-components and condensation reactions. The catalyst can be recovered by simple filtration and used for several times without a significant loss of catalytic activity. (C) 2014 Elsevier B.V. All rights reserved.
Silica Chloride Catalysed One-pot Synthesis of 13-Aryl-indeno[1,2-<i>b</i>]naphtha[1,2-e]pyran-12(13<i>H</i>)-ones under Solvent-free Conditions
作者:Li-Qiang Wu、Li-Min Yang、Xiao Wang、Fu-Lin Yan
DOI:10.1002/jccs.201000102
日期:2010.8
AbstractA simple and facile synthesis of 13‐aryl‐indeno[1,2‐b]naphtha[1,2‐e]pyran‐12(13H)‐ones has been accomplished by the one‐pot condensation of β‐naphthol, aldehydes, and 2H‐indene‐1,3‐dione under solvent‐free conditions in the presence of the heterogeneous catalyst silica chloride.
Sulfamic acid-catalyzed synthesis of 13-aryl-indeno[1,2-b]-naphtha[1,2-e]pyran-12(13H)-ones under solvent-free conditions
作者:Li Qiang Wu、Wei Lin Li、Fu Lin Yan
DOI:10.1002/jhet.445
日期:——
Abstractmagnified image The reaction of β‐naphthol with arylaldehydes and 2H‐indene‐1,3‐dione in the presence of sulfamic acid (3 mol %) under solvent‐free conditions led to 13‐aryl‐indeno[1,2‐b]naphtho[1,2‐e]pyran‐12(13H)‐ones in good yields. J. Heterocyclic Chem., (2010).