Stereocontrolled Photocyclization of 1,2-Diketones: Application of a 1,3-Acetyl Group Transfer Methodology to Carbohydrates
作者:Antonio J. Herrera、María Rondón、Ernesto Suárez
DOI:10.1021/jo702663w
日期:2008.5.1
Photolysis of 1-glycosyl-2,3-butanodione derivatives using visible light is a mild and selective procedure for the synthesis of chiral 1-hydroxy-1-methyl-5-oxaspiro[3.5]nonan-2-one carbohydrate derivatives. The results strongly suggest that stereocontrol of the cyclization is dependent on conformational and stereoelectronic factors. Further oxidative opening, of the 1-hydroxy-1-methyl-2-cyclobutanone moiety affords new C-ketoside derivatives either in C- and O-glycoside series. This tandem two-step process could be considered to be a stereocontrolled 1,3-transference of an acetyl group, and it can be applied either to pyranose and furanose models.
Carbocyclische Verbindungen aus Monosacchariden. I. Umsetzungen in der glucosereihe
作者:Bruno Bernet、Andrea Vasella
DOI:10.1002/hlca.19790620629
日期:1979.9.19
Carbocyclic Compounds fromMonosaccharides. 1. Transformations in the Glucose Series