α-Cyclodextrin compounds containing benzoic, acetylsalicylic, and 2-(4-isobutylphenyl)propionic acid residues
摘要:
Selectively substituted derivatives of alpha-cyclodextrin and hexa-O-tert-butyldimethylsilyl-alpha-cyclodextrin containing a definite number of acylated primary or secondary hydroxy groups were synthesized using benzoic, acetylsalicylic, and 2-(4-isobutylphenyl)propionic acid chlorides in various solvents in the presence of different bases. The acyl residues were assigned to the C(2), C(3), or C(6) atoms in the carbohydrate fragments on the basis of (13)C NMR data. Desilylation of the silyl derivatives with ammonium fluoride in methanol gave the corresponding O-acyl derivatives having free primary hydroxy groups in the alpha-cyclodextrin skeleton.