Chromium-Mediated Stereoselective Synthesis of Carbohydrate-Derived (<i>E</i>)-α,β-Unsaturated Esters or Amides
作者:Humberto Rodríguez-Solla、Carmen Concellón、Elena G. Blanco、Juan Ignacio Sarmiento、Pamela Díaz、Raquel G. Soengas
DOI:10.1021/jo200548g
日期:2011.7.1
A chromium-mediated novel synthesis of carbohydrate-derived di- and trisubstituted (E)-α,β-unsaturatedesters or amides from a range of dichloroesters or amides and a variety of sugar aldehydes is reported. The process took place with total stereoselectivity and in high yields. A mechanism based on a sequential chromium-promoted aldol-type reaction and a completely stereoselective β-elimination reaction