[GRAPHICS]This letter describes the reduction to practice of a novel concept for functionalization of the anomeric carbon of carbohydrates with a nitrogen substituent. Thus, bisheterodienes with a thiono sulfur terminus and a sulfonylimine terminus are shown to undergo cycloaddition smoothly and stereoselectively to three different glycals.
[GRAPHICS]This letter describes the reduction to practice of a novel concept for functionalization of the anomeric carbon of carbohydrates with a nitrogen substituent. Thus, bisheterodienes with a thiono sulfur terminus and a sulfonylimine terminus are shown to undergo cycloaddition smoothly and stereoselectively to three different glycals.
Retro Diels-Alder (RDA) reaction to form α-oxosulfines under very mild conditions. These reactive intermediates can be successfully trapped as dienophiles or as electron poor dienes in InverseElectronDemandDiels-Alderreaction (IEDDA). The relationship between the structure of the starting sulfoxide, the geometry of the intermediate sulfine and the stereochemistry of the final cycloadduct have been
作者:Baoqing Li、Richard W. Franck、Giuseppe Capozzi、Stefano Menichetti、Cristina Nativi
DOI:10.1021/ol990583l
日期:1999.7.1
[GRAPHICS]This letter describes the reduction to practice of a novel concept for functionalization of the anomeric carbon of carbohydrates with a nitrogen substituent. Thus, bisheterodienes with a thiono sulfur terminus and a sulfonylimine terminus are shown to undergo cycloaddition smoothly and stereoselectively to three different glycals.