Synthesis of β-Amino Carbonyl Compounds via the Iodine-Alumina Catalyzed Three-Component Coupling Reaction under Microwave Irradiation

Abstract

Iodine-alumina was employed as a catalyst in the coupling reactions of aldehydes, enolizable ketones, or 1,3-dicarbonyls with methyl carbamate or aromatic amines under microwave irradiation to afford β-amino carbonyl compounds in good-to-excellent yields. The key features of this environmentally friendly methodology are its operational simplicity, mild reaction conditions, and less reaction time.

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“…5 In further years, improvement in Biginelli compounds is done by using different catalysts such as polyphosphate ester (PPE) 6 , Bronsted acids viz. p-toluenesulfonic acid 7 , potassium hydrogen sulphate 8 , chloroacetic acid 9 , titanium (IV) chloride 10 , ruthenium (III) chloride 11 , scandium (III)triflate 12 , Iodine-alumina 13 ,Cobalt(II)acetate 14 ,sulphated zirconia 15 , ferric chloride hexahydrate 16 , MgBr 2 17 , nbcl 5 18 , Lewis acids 19,20 viz. Yb (OTf) 3 21 , InCl 3 22 , CuCl 2 23 , SnCl 2 24 , BF 3 .OEt 2 25 , ZrCl 4 26 , L-proline 19 , L-proline methylester hydrochloride 27 , ZnCl 2 28, 29 , Zinc sulphamate 30 , combination catalytic system such as tin chloridelithium chloride 31 , cupric chloride-lithium chloride 32 , ferric chloride/tetraethyl orthosilicates 33 , Trimethylsilyl triflate 34 , strontium(II)triflate 35 , cadmium chloride 36 , methanesulfonic acid 37 , Iron(III) 38 , (AlCl 3 +KI) 39 , bimetal system , Cupy 2 Cl 2 40 , Samariumdiiodide 41 .…”