作者:Ralph A. Raphael、John H.A. Stibbard、Raymond Tidbury
DOI:10.1016/s0040-4039(00)87354-2
日期:1982.1
The synthesis of the cis-fused γ-lactone 2,7-dioxabicyclo-[4,3,0]non-4-en-8-one (3) by two routes is reported. Its stereoselective conversion to a keyintermediate for pseudomonicacidsynthesis is described.
Oxidative ring contraction of benzeneselenenate adducts of glycal ethers. synthesis of showdomycin analogues
作者:Andrew Kaye、Stephen Neidle、Colin B. Reese
DOI:10.1016/0040-4039(88)85267-5
日期:——
then with water and triethylamine gave () in 67% yield; the latter compound was treated with m-chloroperbenzoic acid and the putative ring-contracted aldehyde () obtained was converted into the showdomycinanalogue () in satisfactory overall yield. 3,4,6-Tri-O-benzyl--galactal () was similarly converted into the corresponding α--lyxoside ().