The structure and absolute configuration of “cyclotirucanenol” a new triterpene isolated from Euphorbia tirucalli has been established as 24β-methyl-9β-19-cyclolanost-20-en-3β-ol through chemical and spectroscopic studies including 2D-NMR.

Abstract Amino Sugars, Triflate Displacement, Amino Acids Novel one step syntheses of a new class of phar-macologically interesting 6-amino-6-deoxy sugars are described. The reaction sequence consists of esterifying 1,2:3,4-di-O-isopropylidene-α-D-galac-topyranose with trifluoromethanesulfonic anhydride and reacting the resulting triflate with a variety of suitably protected naturally occurring amino acids. The difficulties which, sometime, are encountered during displacement reactions in carbohydrates are absent.

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