Diastereofacial selection in the 1,2-addition of MeMgX and McLi to 4-oxo sugar:Efficient synthesis of 4-C-methyl-l-S-β-D-gluco- and galactopyranoside building blocks of moenomycin
作者:Manuka Ghosh、Ramesh Kakarla、Michael J. Sofia
DOI:10.1016/s0040-4039(99)00823-0
日期:1999.6
The stereochemical course of the 1,2-addition upon treatment of various 1-thio-4-oxo sugars with MeMgX and MeLi has been determined. The effects of reagent, solvent, and neighboring functionalities in the gluco/galacto (non-chelation/chelation controlled) product distribution are detailed. Stereocontrolled 1,2-addition to these 4-oxo sugars provide access to a number of differently functionalized F unit building blocks of the moenomycin family, and demonstrate the versatility of this transformation. (C) 1999 Elsevier Science Ltd. All rights reserved.