Catalytic performance of bismuth pyromanganate nanocatalyst for Biginelli reactions

Abstract

10Bi 2 Mn 2 O 7 Nano-powders were synthesized via a stoichiometric 1:1 Bi:Mn molar ratio hydrothermal method at 180 ˚C for 48 h in a 1M NaOH aqueous solution. Ultraviolet-Visible (UV-Vis) spectrum analysis showed that the nanostructured Bi 2 Mn 2 O 7 powders possessed strong light absorption in the ultraviolet region and the direct band gap energy was obtained from the UV-Vis spectrum. The as-prepared nanomaterial exhibited high catalytic activity in the one-pot synthesis of the heterocyclic compounds 3,4-dihydropyrimidin-2(1H)-ones (DHPMs) in Biginelli reaction. Experimental design was used to find the optimized reaction conditions. Reusability of the catalyst was 15 also investigated.

Au Nanorod: An Efficient Catalyst for One‐Pot Synthesis of 3,4‐Dihydropyrimidin‐2(1H)‐ones via the Multicomponent Biginelli Reaction.

“…4‐Chlorobenzaldehyde and 4‐bromobenzaldehyde were also reactive in the current method, providing the isolated yields of 92 % and 87 % respectively. As previously reported, a slightly lower yield was obtained in the presence of Bi 2 Mn 2 O 7 nano–powders . p– Nitrobenzaldehyde with strong withdrawing electron substituent was condensed in 89 % isolated yield for 4 h. In the previous report, the Biginelli reaction of p– nitrobenzaldehyde catalyzed by PTA@MIL‐101 afforded the corresponding product in a lower yield .…”

“…The preparation of 3,4‐dihydropyrimidin‐2(1 H )‐ones (DHPMs) and their derivatives have attracted considerable attention due to the pervasiveness of these compounds in pharmaceutical products such as antiviral, antitumor, anti‐inflammatory as well as calcium channel blockers and backbones of anticancer drugs . Until now, three‐component Biginelli condensation is the most common method for the synthesis of dihydropyrimidine derivatives . Although the most direct process to synthesize DHPMs is multicomponent Biginelli condensation, this process often requires three starting materials in reacting to form a product in harsh conditions and affords in moderate yields of corresponding products .…”

“…As previously reported, a slightly lower yield was obtained in the presence of Bi 2 Mn 2 O 7 nanopowders. [24] p-Nitrobenzaldehyde with strong withdrawing electron substituent was condensed in 89 % isolated yield for 4 h. In the previous report, the Biginelli reaction of p-nitrobenzaldehyde catalyzed by PTA@MIL-101 afforded the corresponding product in a lower yield. [49] On a 10 mmol scale, the yields are almost the same as with the optimized condition in the present method ( In conclusion, we have successfully developed an efficient method using Au nanorods colloid for the one-pot threecomponent Biginelli condensation of benzaldehyde derivatives, ethyl acetoacetate, and urea to prepare 3,4-dihydropyrimidin-2(1H)-ones.…”

“…[16][17][18][19][20][21][22][23] Until now, three-component Biginelli condensation is the most common method for the synthesis of dihydropyrimidine derivatives. [20,[24][25][26][27] Although the most direct process to synthesize DHPMs is multicomponent Biginelli condensation, this process often requires three starting materials in reacting to form a product in harsh conditions and affords in moderate yields of corresponding products. [28] To overcome these drawbacks, various liquid and solid catalysts such as Bronsted acid, [29][30][31][32] nanocatalyst, [24,[33][34][35][36][37] ionic liquids, [38][39][40][41][42][43] carbon nanotubes, [44][45][46] and metal organic framework [47][48][49] have been developed.…”

Solar Light Photocatalytic Degradation of Malachite Green by Hydrothermally Synthesized Strontium Arsenate Nanomaterial through Response Surface Methodology

“…Here the A/B cations can be either in the +4/+3 or +5/+2 oxidation states . A 2 B 2 O 7 pyrochlore materials have attracted great interest due to their ability to form substituted and defective structures, allowing fascinating physical properties , . Alkaline earth arsenates(V) are of interest in many different research areas and have been the subject of several previous studies .…”