Continuous-flow Fe-zeolite-catalyzed temperature-directed synthesis of bioactive tetraketones and xanthenes using epoxides and cyclic-1,3-diketones via a Meinwald rearrangement

Abstract

An environmentally benign approach for the bioactive tetraketones using epoxides and cyclic-1,3-diketones in the presence of Fe-zeolite as a catalyst via Meinwald rearrangement has been developed under batch and continuous...

Functionalized graphene oxide by 4-amino-3-hydroxy-1-naphthalenesulfonic acid as a heterogeneous nanocatalyst for the one-pot synthesis of tetraketone and tetrahydrobenzo[b]pyran derivatives under green conditions

“…49,64,65 Different protocols have been introduced for the synthesis of tetraketone and tetrahydrobenzo[b]pyran derivatives by using a variety of catalysts in recent years. 66,67 So far, numerous heterogeneous and homogeneous catalysts for the synthesis of tetraketones have been reported, such as [H-Pyrr][HSO4], 68 Lhistidine in ionic liquid, 69 nano SiO2Cl, 70 amino-appended βcyclodextrin, 71 Cu2(NH2-BDC)2(DABCO), 72 Fe-zeolite, 73 and 2aminopyrazine. 74 Similarly, a wide range of methods have been developed for the synthesis of tetrahydrobenzo[b]pyrans using different catalytic systems such as sodium alginate, 75 piperazine-GO, 76 SO3H-functionalized nano-MGO-D-NH2, 77 Cs-EDTA-Cell network, 78 nano α-Al2O3 supported ammonium dihydrogen phosphate (NH4H2PO4/Al2O3), 79 proline-modified and propylamine-modified SBA-15, 80 PMO-ICS, 81 and FeNi3-SiO2 nanoparticles.…”