Organocatalysis by p-sulfonic acid calix[4]arene: A convenient and efficient route to 2,3-dihydroquinazolin-4(1H)-ones in water

Matiur Rahman, Irene Ling, Norbani Abdullah, Rauzah Hashim, Alakananda Hajra

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30 Citations (Scopus)


An efficient and eco-friendly method is reported for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones from the direct cyclocondensation of anthranilamide with aldehydes using p-sulfonic acid calix[4]arene (p-SAC) as a recyclable organocatalyst in excellent yields in water at room temperature. The catalyst was reusable without significant loss of catalytic efficiency. Operational simplicity, the compatibility with various functional groups, non-chromatographic purification technique, high yields and mild reaction conditions are the notable advantages of this procedure. Large scale reaction demonstrated the practical applicability of this methodology.

Original languageEnglish
Pages (from-to)7755-7760
Number of pages6
JournalRSC Advances
Issue number10
Publication statusPublished - 2015
Externally publishedYes

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