Unusual protons: Brønsted acids sandwiched between sheets of solid acids, such as montmorillonites, activated quinone monoacetals 1 to selectively react with aromatic nucleophiles 2 in an unprecedented substitution reaction. The synthetic utility of the strategy for obtaining highly oxygenated biaryls 3 is highlighted by the synthesis of gilvocarcin aglycones.
不寻常的质子:夹在固体酸片之间的布朗斯台德酸,例如
蒙脱土,活化了醌单
缩醛1,从而在前所未有的取代反应中选择性地与芳香亲核试剂2反应。gilvocarcin苷元的合成突显了获得高度
氧化的联芳基3的策略的合成实用性。