a green and eco-friendly method for the synthesis of xanthene derivatives using cellulose sulfuric acid under solvent-free conditions
نویسندگان
چکیده
a green and convenient method for the synthesis of 14-aryl-14h-dibenzo[a,i]xanthene-8,13-diones and spiro[dibenzo[a,i]-xanthene-14,3'-indoline]-2',8,13-triones in the presence of a catalytic amount of cellulose sulfuric acid (csa) as an efficient biopolymer-based catalyst under solvent-free conditions at 100 °c is described. the condensation reactions of β-naphtol, 2-hydroxynaphthalene-1,4-dione with aldehydes or isatins to afford the corresponding xanthenes in good to excellent yields. to the best of our knowledge, it is the first example of a multicomponent reaction to the synthesis of these compounds using cellulose sulfuric acid. the present approach offers several advantages such as shorter reaction times, simple work-up, excellent yields, non-toxicity of the catalyst, and solvent-free conditions. moreover, cellulose sulfuric acid is successfully reused for four cycles without significant less of activity.
منابع مشابه
A green and eco-friendly method for the synthesis of xanthene derivatives using cellulose sulfuric acid under solvent-free conditions
A green and convenient method for the synthesis of 14-aryl-14H-dibenzo[a,i]xanthene-8,13-diones and spiro[dibenzo[a,i]-xanthene-14,3'-indoline]-2',8,13-triones in the presence of a catalytic amount of cellulose sulfuric acid (CSA) as an efficient biopolymer-based catalyst under solvent-free conditions at 100 °C is described. The condensation reactions of β-naphtol, 2-hydroxynaphthalene-1,4-dion...
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عنوان ژورنال:
iranian chemical communicationناشر: payame noor university (pnu)
ISSN 2423-4958
دوره
شماره Articles in Press 2015
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