An efficient and direct procedure for the synthesis of novel 12-aryl- or 12-alkyl-8,9,10,12-tetrahydrobenzo[ A]xanthen-11-one derivatives has been described. The process employs a three-component condensation reaction in one-pot using 2-naphthol, aldehydes and cyclic 1,3-dicarbonyl compounds in the presence of a catalytic amount of NaHSO 4 ·SiO 2 in 1,2-dichloroethane under reflux.
Methanesulfonic Acid-Catalyzed One-Pot Synthesis of 12-Aryl or 12-Alkyl-8,9,10,12-tetrahydrobenzo[<i>a</i>]xanthen-11-one Derivatives
作者:Yu-Heng Liu、Lei Li
DOI:10.1002/jhet.882
日期:2012.7
An efficient synthesis of 12‐aryl or 12‐alkyl‐8,9,10,12‐tetrahydrobenzo[a]xanthen‐11‐one derivatives has been developed under solvent‐free conditions by one‐pot condensation of aldehydes, 2‐naphthol, and cyclic 1,3‐dicarbonyl compounds in the presence of a catalytic amount of methanesulfonic acid. The protocol has advantages of mild condition, short reaction time, high yield, and operational simplicity
在无溶剂条件下,通过一锅法醛,2-萘酚,2-萘酚的缩合反应,已开发出有效合成12-芳基或12-烷基-8,9,10,12-四氢苯并[ a ]黄嘌呤-11-one衍生物的方法。和环状1,3-二羰基化合物在催化量的甲磺酸存在下 该方案具有条件温和,反应时间短,产率高和操作简单的优点。