Synthesis of two derivatives of tigogenyl disaccharides containing N-acetylglucosamine and the long range shielding effect of benzoyl groups

Two tigogenyl glycosides containing N-acetylglucosamine were synthesized. Their structures were confirmed by 1H and 13C NMR spectra. The shielding effect caused by benzoyl groups was elucidated by 1H NMR, COSY, HSQC, HMBC spectroscopy.