The Synthesis of Substituted Benzo[c]chromen-6-ones by a Suzuki Coupling and Lactonization Sequence Using Ionic Liquids – from Laboratory Scale to Multi-Kilogram Synthesis
作者:Gerardus J. Kemperman、B. Ter Horst、D. Van de Goor、T. Roeters、J. Bergwerff、R. Van der Eem、J. Basten
DOI:10.1002/ejoc.200600188
日期:2006.7
A series of benzo[c]chromen-6-ones are prepared by a Suzuki coupling and lactonization sequence starting with 2-methoxyphenylboronic acids and methyl 2-bromobenzoate derivatives. The use of ionic liquids in this synthesis has been explored. It was found that the Suzuki coupling proceeds much faster when a catalytic amount of the ionic liquid [BMIM][PF6] is used. By using the Lewis acidic ionic liquids
通过 Suzuki 偶联和内酯化序列,以 2-甲氧基苯基硼酸和 2-溴苯甲酸甲酯衍生物为起始原料,制备了一系列苯并 [c] chromen-6-ones。已经探索了在该合成中使用离子液体。发现当使用催化量的离子液体 [BMIM][PF6] 时,Suzuki 偶联进行得更快。通过使用路易斯酸性离子液体 [BMIM][Al2Cl7] 或 [TMAH][Al2Cl7],从 Suzuki 偶联获得的 2-(2-甲氧基苯基)苯甲酸甲酯产物可以在一步,而传统的路线涉及三个步骤。在各种苯并[c]色烯-6-酮的合成中证明了离子液体的使用。还表明离子液体的应用不仅限于实验室规模的实验,随着工艺的开发和实施,其规模达到了数公斤。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)