DBU Acetate Mediated: One-pot Multi Component Syntheses of Dihydropyrano[3,2-c]quinolones
作者:Rajasekar Bhupathi、Bandi Madhu、B. Rama Devi、Ch. Venkata Ramana Reddy、P. K. Dubey
DOI:10.1002/jhet.2506
日期:2016.11
Three‐component reaction involving condensation of 1‐methylquinoline‐2,4(1H,3H)‐dione(1), aromatic aldehydes (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h) and malononitrile/cyanoaceticester (3a, 3b) in(1,8‐diazabicyclo[5.4.0]‐undec‐7‐en‐8‐ium acetate)}[DBU][Ac] as task‐specific ionic liquid leading to the efficient synthesis of dihydropyrano[3,2‐c]quinolones (4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j, 4k, 4l, 4m
三组分反应涉及1-甲基喹啉-2,4(1H,3H)-二酮(1),芳香醛(2a,2b,2c,2d,2e,2f,2g,2h)和丙二腈/氰基乙酸酯(3a,3b)1,8-diazabicyclo [5.4.0] -undec-7-en-8-醋酸盐}} [DBU] [Ac]中的盐作为任务特定的离子液体,可有效合成二氢吡喃[3 ,2-c]喹诺酮类(4a,4b,4c,4d,4e,4f,4g,描述了图4h,4i,4j,4k,4l,4m,4n,4o,4p)。该方法方便,温和,无需使用柱色谱法即可提供高收率的产品。