A Mild and Efficient Protocol for the Protection of 3-Hydroxychromones Under Phase-Transfer Catalysis
作者:Alain Burger、Dmytro Dziuba、Rachid Benhida
DOI:10.1055/s-0030-1260034
日期:2011.7
A mild and efficient protocol for the introduction of different protecting groups on 3-hydroxychromones (3-HCs) under phase-transfer catalysis conditions in toluene or dichloromethane/aqueous potassium hydroxide system in the presence of crown ether has been developed. The method is useful for the protection of base-sensitive chromone derivatives. Protected chromones are easier to handle and to purify
已经开发了一种温和有效的方案,用于在冠醚存在下在甲苯或二氯甲烷/氢氧化钾水溶液中的相转移催化条件下在3-羟基色酮(3-HCs)上引入不同的保护基。该方法对于保护对碱敏感的色酮衍生物是有用的。受保护的色酮更易于处理和纯化,因此适合进一步的化学转化。使用标准条件干净地裂解保护基。 3-羟基色酮-相转移催化-保护基-酰化-烷基化-裂解