Highly Diastereoselective Dioxetane Formation in the Photooxygenation of Enecarbamates with an Oxazolidinone Chiral Auxiliary: Steric Control in the [2 + 2] Cycloaddition of Singlet Oxygen through Conformational Alignment
作者:Waldemar Adam、Sara G. Bosio、Nicholas J. Turro
DOI:10.1021/ja026815k
日期:2002.7.1
The photooxygenation of oxazolidinone-substituted enecarbamates leads to diastereomerically pure dioxetanes. The high diastereoselectivity is rationalized in terms of effective pi-facial control achieved by shielding one side of the double bond with the chiral auxiliary. The absolute configuration of the dioxetanes is assigned by derivatization to diols.
恶唑烷酮取代的烯氨基甲酸酯的光氧化产生非对映异构纯的二氧杂环丁烷。就通过用手性助剂屏蔽双键的一侧实现的有效 pi 面控制而言,高非对映选择性是合理的。二氧杂环丁烷的绝对构型通过衍生化分配给二醇。