Synthesis of enantiopure C-glycosides and pseudo C-glycosides: Lewis-acid mediated heterolysis of methyl acetals
作者:Oliver Gaertzen、Andrea M. Misske、Peter Wolbers、H.M.R. Hoffmann
DOI:10.1016/s0040-4039(99)01224-1
日期:1999.8
Lewis-acid mediated heterolysis of substituted methoxy acetals derived from anomeric [3.3.1] oxabicyclic lactones leads to enantiopure deoxy C-glycosides in excellent chemical yield. An alternative route to C-glycosidic esters involves simple one-step opening of [3.3.1] oxabicyclic lactones with in situ esterification. (C) 1999 Elsevier Science Ltd. All rights reserved.
Asymmetric synthesis of a seven carbon anit-3,5-diol building block. A polyacetate derivative with completely resolved C 2 symmetry
作者:Thomas F. J. Lampe、H. M. R. Hoffmann
DOI:10.1039/cc9960001931
日期:——
Methyl (3R,5R)-5-benzyloxy-7-([1,3]dithian-2-yl)-3-hydroxyheptanoate (+)-7 has been prepared from 8-oxabicyclo[3.2.1]oct-6-en-3-one 1 in 7 steps and 40% overall yield.