Anomalous Horner-Wadsworth-Emmons reactions on 3,4-enuloses
作者:Oscar M. Moradei、Cecile M. du Mortier、Alicia Fernández Cirelli
DOI:10.1016/s0040-4020(97)00425-0
日期:1997.6
Pyranosic enuloses were subjected to Horner-Wadsworth-Emmons (HWE) conditions using the enolate of dimethyl(methoxycarbonyl)methyl phosphonate and its ethyl analogue. 3-O-Phosphorylation of the products as well as an unusual stereoespecificity were observed. A mechanism involving a phosphonate-phosphate like rearrangement through a five member intermediate followed by benzoate elimination is proposed