Domino Michael/Retro-Michael/Mukaiyama-Aldol Reactions of 1,3-Bis-Silyl Enol Ethers with 3-Acyl- and 3-Formylbenzopyrylium Triflates – Synthesis of Functionalised 2,4′-Dihydroxybenzophenones
作者:Bettina Appel、Sven Rotzoll、Remo Kranich、Helmut Reinke、Peter Langer
DOI:10.1002/ejoc.200600082
日期:2006.8
3-bis-silyl enol ethers with 3-acyl- and 3-formylbenzopyrylium triflates, which can be generated in situ from 3-acyl- and 3-formylchromones, affords a great variety of functionalised 2,4′-dihydroxybenzophenones and 4-(2-hydroxybenzoyl)salicylates. These products are formed by a domino Michael/retro-Michael/Mukaiyama-aldol reaction. This methodology is successfully applied to the synthesis of novel UV-A/B and
1,3-双-甲硅烷基烯醇醚与 3-酰基-和 3-甲酰基苯并吡喃三氟甲磺酸酯的反应,可以由 3-酰基-和 3-甲酰基色酮原位生成,提供了多种功能化的 2,4'-二羟基二苯甲酮和 4-(2-羟基苯甲酰基)水杨酸盐。这些产品是由多米诺迈克尔/逆迈克尔/Mukaiyama-羟醛反应形成的。该方法已成功应用于合成新型 UV-A/B 和 UV-B 过滤器。三种 4-(2-羟基苯甲酰基) 水杨酸在选择素生物测定中显示出良好的体外活性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)