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STEREOSELECTIVE SYNTHESIS OF METHYL TETRA-0-METHYL a-AND P-D-GLUCO-AND MANNOPYRANOSIDES

Journal of Sciences, Islamic Republic of Iran
مقاله 5، دوره 3، شماره 1، 1992    اصل مقاله (291.18 K)
چکیده
Methyl tetra - 0-methyl- ?-D- glucopyranoside is stereoselectively prepared
from tetramethyl-D- glucopyranose by using (MeI+NaH) in toluene (86%) or
cyclohexane (85%), while its ?- isomer is best synthesized in hexamethyl
phosphoramide (64%). Similarly, methyl tetra-o-methyl-?- D-mannopyranoside is
synthesized in cyclohexane (80%), while its ?- isomer is predominantly prepared
by (MeI+n-BuLi) in cyclohexane (98%). The ?-and ?- isomers of these glycosides
were identified and quantified by G.C
آمار
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