[structure: see text]. A new strategy for the synthesis of substituted azulenes is reported, based on the reaction of beta'-bromo-alpha-diazo ketones with rhodium carboxylates. The key transformation involves intramolecular addition of a rhodium carbenoid to an arene pi-bond, electrocyclic ring opening, beta-elimination, tautomerization, and trapping to produce 1-hydroxyazulene derivatives. The synthetic
[结构:见文字]。基于β'-
溴-α-重
氮酮与
羧酸铑的反应,已报道了一种合成取代的天青烯的新策略。关键的转化涉及将
铑类
胡萝卜素分子内添加到
芳烃pi键上,电环开环,β消除,互变异构化和捕获以生成1-羟基氮杂烯衍
生物。该方法的合成效用通过
三氟甲磺酸酯衍
生物参与Suzuki偶联反应的能力得以增强,如抗溃疡药白蛋白
钠(KT1-32)的合成所示。