Synthesis of 7-hydroxy-2-(2-hydroxybenzoyl)benzo[c]chromen-6-ones by sequential application of domino reactions of 1,3-bis(silyl enol ethers) with benzopyrylium triflates
作者:Mathias Lubbe、Bettina Appel、Anke Flemming、Christine Fischer、Peter Langer
DOI:10.1016/j.tet.2006.09.029
日期:2006.12
ol, reaction of 2,4-bis(trimethylsilyloxy)penta-1,3-diene with 3-formylchromones afforded 4-(2-hydroxybenzoyl)-2-acetylphenols, which were transformed into 6-(2-hydroxybenzoyl)chromones. The Me3SiOTf-mediated condensation of the latter with 1,3-bis(silyl enol ethers) and subsequent domino ‘retro-Michael–aldol–lactonization’ reaction afforded 7-hydroxy-2-(2-hydroxybenzoyl)benzo[c]chromen-6-ones.
2,4-双(三甲基甲硅烷氧基)戊-1,3-二烯与3-甲酰基色酮的多米诺反应,形成4-(2-羟基苯甲酰基)-2-乙酰基苯酚,将其转化为6 -(2-羟基苯甲酰基)色酮。Me 3 SiOTf介导的后者与1,3-双(甲硅烷基烯醇醚)的缩合反应和随后的多米诺骨牌“迈克尔-复古-醇醛-内酯化”反应得到7-羟基-2-(2-羟基苯甲酰基)苯并[ c ] chromen-6-ones。