Polyaniline salts and complexes: Efficient and reusable catalyst for the one‐pot synthesis of 5‐(methoxycarbonyl)‐6‐methyl‐4‐phenyl‐3,4‐dihydropyrimidin‐2(1h)‐one

Abstract

Polyaniline salts were prepared by doping polyaniline base with different Bronsted acids (sulfuric, nitric, phosphoric, perchloric, hydrochloric acid) and organic acids (p-toluene sulfonic acid, 5-sulfosalicylic acid). Polyaniline complexes were also prepared using Lewis acids (aluminum chloride, ferric chloride). Polyaniline salts and polyaniline complexes were used as catalysts in Biginelli reaction for 5-(methoxycarbonyl)-6-methyl-4-phenyl-3,4-dihydropyrimidin-2(1H)-one synthesis. Benzaldehyde and urea were reacted with methyl acetoacetate using polyaniline-p-toluene sulfonate salt as catalyst with different reaction time, temperature, and amount of catalyst. The use of polyaniline catalysts is feasible because of the easy preparation, easy handling, stability, easy recovery, simple work-up procedure, reusability, excellent activity with less amount of catalyst, and eco-friendly nature.

Polyaniline salt containing dual dopants, pyrelenediimide tetracarboxylic acid, and sulfuric acid: Fluorescence and supercapacitor

“…PANI-sulfuric acid salt (PANI-H 2 SO 4 ) and its corresponding PANI base was prepared by following our earlier report. 32 N,N 0 -bis[glutamic acid]-3,4,9,10-perylenetetracarboxylicdiimide (PDITCA) was synthesized by following literature protocol. 33 All the reactions were carried out with distilled water.…”

“…Tetrabutyl ammonium hexafluorophosphate were purchased from Sigma Aldrich, Bengaluru, India. PANI‐sulfuric acid salt (PANI‐H 2 SO 4 ) and its corresponding PANI base was prepared by following our earlier report . N , N ′‐ bis [glutamic acid]‐3,4,9,10‐perylenetetracarboxylicdiimide (PDITCA) was synthesized by following literature protocol .…”

Investigation of efficient synthesis of 1, 8-dioxo-octahydroxanthene derivatives under solvent-free grinding method

“…13,14,[18][19][20] The polyaniline supported and Clayfen catalysts were prepared using already reported method. 21,22 …”

2,6‐Pyridinedicarboxylic Acid (PDCA) Catalyzed Improved Synthetic Approach for 1‐Amidoalkyl Naphthols, Dihydropyrimidin‐2(1H)‐ones and Bis‐indoles

“…DHPMs motif present in numerous drug substance and biological agent, which are largely used for the treatment of anti-hypertensive, [41] antitumor, [42] calcium channel blocking, [42] a-1 a-adrenergic antagonist, [43] antioxidant, [42] anticancer, [42] antitubercular, [42] antimicrobial, [42] antibacterial, [43] antidepressant, [44] antidiabetic, [41] cardiovascular disorders, [42] neuroprotection, [42] radio-protection, [44] chelating agent, [41] HIV protease inhibition [45] and topoisomerase inhibitor. [45] (Figure 2)…”