Synthesis of benzo[ a ]furo[2, 3- c ]phenazine derivatives through an efficient, rapid and via microwave irradiation under solvent-free conditions catalyzed by H ₃ PW ₁₂ O ₄₀ @Fe ₃ O ₄ -ZnO for high-performance removal of methylene blue

Abstract

Synthesis of benzo[a]furo[2, 3-c]phenazine derivatives through an efficient, rapid and via microwave irradiation under solvent-free conditions catalyzed by H 3 PW 12 O 40 @Fe 3 O 4 -ZnO for highperformance removal of methylene blue,

Aryl glyoxal: a prime synthetic equivalent for multicomponent reactions in the designing of oxygen heterocycles

“…energy demand, and economically affordable chemicals were the major advantages of this reaction protocol (Scheme 33). 63 Taheri and colleagues performed the same reaction in 2021 to develop an easy, efficient, and straightforward protocol for the synthesis of benzo[a]furo[2,3-c]phenazine 68 derivatives in excellent yields by the reaction of benzo[a]phenazin-5-ol 65, 1, and 67 utilizing the Fe 3 O 4 @rGO@ZnO-HPA catalyst and keeping the other conditions similar to the previous reaction (Scheme 34). 64 A one-pot multicomponent reaction leading to the synthesis of urea-substituted 2-arylfurans 71 was reported for the rst time by Andrey N. Komogortsev's group by reacting numerous carbo and heterocyclic enols 69, cyanamide 70, and aryl glyoxal 1 under reux conditions in the presence of the solvent acetonitrile and base triethylamine (Scheme 35).…”

“…The facile and quick extraction of the products, short reaction time, mild reaction conditions, high product yield, solvent-free conditions, low energy demand, and economically affordable chemicals were the major advantages of this reaction protocol (Scheme 33). 63…”

A review on lawsone-based benzo[a]phenazin-5-ol: synthetic approaches and reactions

“…This then forms intermediate 210 through the intramolecular ring closure, followed dehydration leads to the formation of the desired product 206. 94 …”

“…After that, intermediate 207 reacts with intermediate 208 to give an intermediate 209. This then forms intermediate 210 through the intramolecular ring closure, followed dehydration leads to the formation of the desired product 206 . 94…”