β-Alkoxycarbonyl Enol Triflates as Precursors of Stereopure 3-Ene-1,5-diyne Building Blocks for the Chromophores of Neocarzinostatin, C-1027, Kedarcidin, Maduropeptin, and N1999A2
Lithium tri-s-butylborohydride and lithiumaluminumhydride were found to be efficient reducingagents for the stereoselective preparation of syn-glycerol derivatives from (R)-4-acyl-2,2-dimethyl-1,3-dioxolanes. The scope and limitation of the stereoselective L-Selectride reduction of (R)-4-acyl-2,2-dimethyl-1,3-dioxolanes were also described.