Ruthenium trichloride catalyzed synthesis of 2,3-unsaturated-N-glycosides via Ferrier azaglycosylation
摘要:
An efficient, economical and mild protocol for the synthesis of 2,3-unsaturated-N-glycosides has been developed using ruthenium(III) chloride. The Ferrier azaglycosylation of glycals with various N-nucleophiles such as sulfonamides, benzamides, carbamates and N-substituted sulfonamides proceeded smoothly to afford the corresponding 2,3-unsaturated-N-glycosides or 'N-pseudoglycals' in good yields (64-98%). High alpha-anomeric selectivity was observed with N-substituted sulfonamides such as N-benzyl or N-phenyl sulfonamides under similar conditions. (C) 2014 Elsevier Ltd. All rights reserved.
The Synthesis of Alkyl and (Hetero)aryl Sulfonamides From Sulfamoyl Inner Salts
作者:Joseph M. Young、Aisha G. Lee、Ramalakshmi Y. Chandrasekaran、Joseph W. Tucker
DOI:10.1021/acs.joc.5b01287
日期:2015.8.21
An approach to the synthesis of sulfonamides from sulfamoyl inner salts and organometallic species is presented. A range of sulfamoyl carbamates, amines, and metals are explored. Primary, secondary, and tertiaryalkyl-, aryl-, and heteroaryllitihium and magnesium nucleophiles were successful. This approach yields bench-stable intermediates and avoids many of the functional group incompatibilities,