Stereoselectivity in the Epoxidation of Carbohydrate-Based Oxepines
作者:Shankar D. Markad、Shijing Xia、Nicole L. Snyder、Bikash Surana、Martha D. Morton、Christopher M. Hadad、Mark W. Peczuh
DOI:10.1021/jo800979a
日期:2008.8.1
the DMDO epoxidation of carbohydrate-based oxepines derived from glucose, galactose, and mannose has been determined by product analysis and density functional theory (DFT, B3LYP/6-31+G**//B3LYP/6-31G*) calculations. Oxepines 3 and 4, derived from d-galactose and d-mannose, largely favor α- over β-epoxidation. The results reported here, along with selectivities in the DMDO-mediated epoxidation of d-xylose-based
Hydroxyl group orientation affects hydrolysis rates of methyl α-septanosides
作者:Shankar D. Markad、Shawn M. Miller、Martha Morton、Mark W. Peczuh
DOI:10.1016/j.tetlet.2009.12.109
日期:2010.2
Hydrolysisrates for three related methyl α-septanosides were obtained. The septanosides were synthesized via mCPBA epoxidation and methanolysis of d-mannose, d-galactose, and d-glucose-based oxepines. The rate of hydrolysis correlates with the orientation of hydroxyl groups on the septanose ring in a manner analogous to pyranosides.