TY - EJOUR
AU - Hajipour, Abdol Reza
AU - Sheikhan, Nafisehsadat
AU - Alaei, Mohammad Ali
AU - Zarei, Amin
PY - 2024
DA - February
TI - Brønsted acidic ionic liquid as the efficient and reusable catalyst for synthesis of coumarins via Pechmann condensation under solvent-free conditions
T2 - Iranian Journal of Catalysis
VL - 5
L1 - https://oiccpress.com/iranian-journal-of-catalysis/article/bronsted-acidic-ionic-liquid-as-the-efficient-and-reusable-catalyst-for-synthesis-of-coumarins-via-pechmann-condensation-under-solvent-free-conditions/
N2 - A mild and efficient method has been developed for the preparation of substituted coumarins from reaction of various phenols with different β-ketoesters via Pechmann condensation in the presence of Brønsted acidic ionic liquid (N-(4-sulfonic acid) butyl triethylammonium hydrogen sulfate) as an effective catalyst under solvent-free conditions. Different phenols reacted with ethyl acetoacetate to produce the corresponding substituted coumarins in high to excellent yields and short reaction times. Moreover, [TEBSA][HSO4] has been used as an effective green catalyst for the synthesis of coumarin derivatives under solvent-free conditions. Using the relatively non-toxic (halogen-free) and reusable Brønsted acidic ionic liquid, high catalytic efficiency, high yields, short reaction times and straightforward work-up are advantages of this protocol.
IS - 3
PB - OICC Press
KW - Bronsted acidic ionic liquid, Coumarins, β-ketoesters, N-(4-sulfonic acid) butyl triethylammonium hydrogen sulfate ([TEBSA][HSO4]) 
EN -