Stereospecific Entry to [4.5]Spiroketal Glycosides Using Alkylidenecarbene C−H Insertion
作者:Duncan J. Wardrop、Wenming Zhang、Joseph Fritz
DOI:10.1021/ol016975l
日期:2002.2.1
stereospecific preparation of [4.5]spiroketal glycosides utilizing the 1,5 C-H bond insertion of alkylidenecarbenes is described. Treatment of 2-oxopropyl beta-pyranosides A with lithium (trimethylsilyl)diazomethane in THF at -78 degrees C afforded 1,6-dioxaspiro[4,5]decenes B in good yield. Submission of the corresponding alpha-glycosides C to the same reagent gave the isomeric insertion products D in moderate