Synthesis of <i>C</i>-Septanosides from Pyranoses via Vinyl Addition and Electrophilic Cyclization
作者:Raghu Vannam、Mark W. Peczuh
DOI:10.1021/ol401769k
日期:2013.8.16
A two-stepsynthesis of C-septanosides from pyranoses is reported. Vinyl addition to tetra-O-benzyl d-glucose, d-galactose, and d-mannose gave the corresponding allylic alcohols. Electrophilic cyclization followed by treatment with iodine gave iodomethyl C-septanosides suitable for substitution reactions. The cyclizations were diastereoselective, giving cis-1,2 configured C-septanosides. Selectivity