New DBU (1,8-Diazabicyclo[5.4.0]undec-7-ene) Assisted One-Pot Synthesis of 2,8-Disubstituted 4H-1-Benzopyran-4-ones
作者:Carlo Riva、Carlo De Toma、Leandro Donadel、Carlo Boi、Renzo Pennini、Gianni Motta、Amedeo Leonardi
DOI:10.1055/s-1997-1168
日期:1997.2
2-Hydroxy-3-(alkoxycarbonyl or prop-1-enyl)phenyl alkyl ketones are easily converted into 2,8-disubstituted (3-methyl)-4H-1-benzopyran-4-ones through a new DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) assisted one-pot synthesis, by reaction with aroyl or alkanoyl chlorides or anhydrides. The method is simple, mild and convenient as compared to the existing multistep procedures.
2-羟基-3-(烷氧羰基或丙-1-烯基)苯基烷基酮通过与芳酰氯或脂肪酰氯、酸酐反应,在新的DBU(1,8-二氮杂双环[5.4.0]十一碳-7-烯)辅助的一锅合成中,容易转化为2,8-二取代的(3-甲基)-4H-1-苯并吡喃-4-酮。与现有的多步程序相比,该方法简单、温和且方便。