Stereoelectronic Factors in the Stereoselective Epoxidation of Glycals and 4-Deoxypentenosides
作者:Laura Alberch、Gang Cheng、Seung-Kee Seo、Xuehua Li、Fabien P. Boulineau、Alexander Wei
DOI:10.1021/jo102382r
日期:2011.4.15
stereoselectivity uponepoxidation with dimethyldioxirane (DMDO). In most cases, the glycals and their corresponding 4-DP isosteres share the same facioselectivity, implying that the pyran substituents are largely responsible for the stereodirecting effect. Fully substituted dihydropyrans are subject to a “majority rule”, in which the epoxidation is directed toward the face opposite to two of the three groups. Removing