Facile Preparation of Protected Furanoid Glycals from Thymidine
摘要:
The synthesis of O-silyl- and O-acyl-protected furanose glycals from free thymidine was investigated. The method of glycal formation reported by Pedersen et al. was successfully expanded to include 5-ester (toluoyl) protected glycals as well as various combinations of 5'-ester and 3- and 5-tert-butyldimethylsilyl and tert-butyldiphenylsilyl protection. Gram quantities of furanoid glycals can be prepared in a few days in two-four synthetic steps in overall yields ranging from 17 to 80%.
The [2,3]-Wittig rearrangement route toward annonaceous acetogenins from furanoid glycals: a preliminary study
作者:P. Bertrand、J.-P. Gesson、B. Renoux、I. Tranoy
DOI:10.1016/0040-4039(95)00684-5
日期:1995.6
The [2,3]-Wittig rearrangement of trimethylsilylpropargyl ethers of furanoidglycals derived from D-mannose and L-gulonic γ-lactone affords cis 2,5-disubstituted dihydrofurans with predominant erythro selectivity. Under the same conditions, [1,2]-Wittig rearrangement is observed with a glycal derived from D-ribonic γ-lactone.