N-Trifluoroacetyl-L-acosamine (18) has been chirally synthesised from the chiral educt (1) obtained from cinnamaldehyde and bakers' yeast, whereas N-trifluoroacetyl-L-daunosamine (17) was obtained by inverting the configuration at C-4 of the intermediate δ-lactone (11); compounds (18) and (17) have also been prepared from L-threonine via the δ- and γ-lactones (14) and (9), by inverting the configuration
Total synthesis of carbohydrates. 5. Stereochemistry of the epoxidations of acyclic allylic amides. Applications towards the synthesis of 2,3,6-trideoxy-3-aminohexoses
作者:William R. Roush、Julie A. Straub、Richard J. Brown
DOI:10.1021/jo00232a014
日期:1987.11
A rapid and efficient cycloaddition of simple imines with activated dienes leading to amino sugars; Unusually high “chelation-controlled” diastereoselectivity in the addition to an α,β-dihydroxy imine protected as a ketal.