a new method for synthesis of tetrahydrobenzo[b]pyrans and dihydropyrano[c]chromenes using p-dodecylbenzenesulfonic acid as catalyst in water

نویسندگان

enayatollah sheikhhosseini

dadkhoda ghazanfari

vida nezamabadi

چکیده

p-dodecylbenzenesulfonic acid (dbsa) was used as a catalyst for a simple and efficient one-pot synthesis of aryl substititued tetrahydrobenzo[b]pyrans and dihydropyrano[c]chromens via initial knoevenagel, subsequent micheal and final heterocyclization reactions of aryl aldehyde, malononitrile and 4-hydroxycoumarin/dimedone in moderate to excellent yields. the present method was operationally simple and use of water as the reaction medium made the process environmentally benign.

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A new method for synthesis of tetrahydrobenzo[b]pyrans and dihydropyrano[c]chromenes using p-dodecylbenzenesulfonic acid as catalyst in water

p-Dodecylbenzenesulfonic acid (DBSA) was used as a catalyst for a simple and efficient one-pot synthesis of aryl substititued tetrahydrobenzo[b]pyrans and dihydropyrano[c]chromens via initial Knoevenagel, subsequent Micheal and final heterocyclization reactions of aryl aldehyde, malononitrile and 4-hydroxycoumarin/dimedone in moderate to excellent yields. The present method was operationally si...

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عنوان ژورنال:
iranian journal of catalysis

ناشر: islamic azad university, shahreza branch

ISSN 2252-0236

دوره 3

شماره 4 2013

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