Enecarbamates as Selective Substrates in Oxidations: Chiral-Auxiliary-Controlled Mode Selectivity and Diastereoselectivity in the [2+2] Cycloaddition and Ene Reaction of Singlet Oxygen and in the Epoxidation by DMD and <i>m</i>CPBA
作者:Waldemar Adam、Sara G. Bosio、Nicholas J. Turro、Barbara T. Wolff
DOI:10.1021/jo035745c
日期:2004.3.1
The stereochemical course of the oxidation of chiral oxazolidinone-substituted enecarbamates has been studied for singletoxygen (1O2), dimethyldioxirane (DMD), and m-chloroperbenzoic acid (mCPBA) by examining of the special structural and stereoelectronic features of the enecarbamates. Valuable mechanistic insight into these selective oxidations is gained. Whereas the R1 substituent on the chiral
手性恶唑烷酮取代enecarbamates氧化的立体化学过程已经研究了单重态氧(1 Ò 2),二甲基二(DMD),和中号氯过苯甲酸(米通过的enecarbamates的特殊的结构和立体电子特征检查CPBA) 。获得了对这些选择性氧化的有价值的机理见解。而手性助剂上的R 1取代基负责双键的空间屏蔽,并决定π面非对映选择性的感觉,Z / E构型等结构特征和R 2的性质双键上的基团负责非对映选择性的程度。在1 O 2的情况下,通过乙烯基氮官能团进行的立体电子控制可控制模式选择性(烯反应与[2 + 2]环加成反应)。
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。