Stereoselection in the reaction of acid halides and vinylogous urethanes
作者:Richard H. Schlessinger、James R. Tata、James P. Springer
DOI:10.1016/s0040-4039(00)96744-3
日期:1987.1
Acidhalides which carry either an α-phenyl or α-alkoxy residue show fascinatingly high and useful diastereoselection on condensation with the vinylogous urethane derived ketene acetal enamine 3. Optically active halides of this type undergo reaction with 3 accompanied by very high diastereofacial selectivity.
A route for the synthesis of α-C-glucosides of β-keto esters and ketones through the reaction of the corresponding enamines with 2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl chloride activated by silver(I) trifluoromethanesulphonate is described.