Spacer-Mediated Synthesis of Contra-Thermodynamic Spiroacetals: Stereoselective Synthesis of <i>C</i><sub>2</sub>-Symmetric Difructose Dianhydrides
作者:Enrique M. Rubio、M. Isabel García-Moreno、Patricia Balbuena、Fernando J. Lahoz、Eleuterio Álvarez、Carmen Ortiz Mellet、José M. García Fernández
DOI:10.1021/jo052184b
日期:2006.3.1
The xylylene moiety (ortho, meta, and para) was employed as a rigid tether in the spacer-mediated synthesis of difructosedianhydrides (DFAs), a unique class of bis-spiroacetal derivatives present in food products. The synthetic methodology exploits the suitability of triflic acid to promote spirocyclization in organic solvents under irreversible reaction conditions, using anomeric isopropylidene fructose