Direct Umpolung of Glycals and Related 2,3-Unsaturated<i>N</i>-Acetylneuraminic Acid Derivatives Using Samarium Diiodide
作者:Tien Xuan Le、Caroline Papin、Gilles Doisneau、Jean-Marie Beau
DOI:10.1002/anie.201402891
日期:2014.6.10
The umpolung of glycals with samariumdiiodide offers a simple route to novel carbohydrate‐derived nucleophilic reagents in a single step using a readily available reductant. The corresponding allyl samarium reagent that arises from the hexose series reacts with ketones at the C3 position with high stereoselectivity; carbon–carbon bond formation takes place only anti to the substituent at the C4 position