作者:Harry H. Wasserman、Ronald J. Gambale、Mitchell J. Pulwer
DOI:10.1016/s0040-4020(01)93281-8
日期:——
Oxazoles may be used as masked forms of activated carboxylic acids since they readily form triamides on reaction with singlet oxygen. With 2-alkyl-4,5-diphenyloxazoles, the triamides formed on photooxygenation undergo selective nucleophilic attack at the acyl carbonyl derived from the 2-oxazole position. Using 2-(ω- hydroxyalkyl)-4,5- diphenyloxazoles as substrates, the oxidation-acylation sequence
恶唑可用作活化羧酸的掩蔽形式,因为它们在与单线态氧反应时容易形成三酰胺。对于2-烷基-4,5-二苯基恶唑,在光氧化作用下形成的三酰胺在衍生自2-恶唑位置的酰基羰基上经历选择性的亲核攻击。使用2-(ω-羟烷基)-4,5-二苯基恶唑作为底物,氧化-酰化序列可用于合成大环内酯类化合物,包括(±)-瑞奇奥利德和(±)-二-0-甲基曲维林。