Efficient Synthesis of Novel Coumarin-3-carboxamides (=2-Oxo-2H-1-benzopyran-3-carboxamides) Containing Lipophilic Spacers
作者:Saeed Balalaie、Mohammad Ali Bigdeli、Enayatollah Sheikhhosseini、Azizollah Habibi、Hamed Piri Moghadam、Mehrnoush Naderi
DOI:10.1002/hlca.201100238
日期:2012.3
The novel coumarin‐3‐carboxamides (=2‐oxo‐2H‐1‐benzopyran‐3‐carboxamides) 5a–5g containinglipophilicspacers were synthesized through the Ugi‐four‐component reaction (Scheme 1). The reactions of aromatic aldehydes 1, 4,4′‐oxybis[benzenamine] or 4,4′‐methylenebis[benzenamine] as diamine 2, coumarin‐3‐carboxylic acid (=2‐oxo‐2H‐benzopyran‐3‐carboxylic acid; 3), and alkyl isocyanides 4 lead to the desired