Stereoselective Synthesis of 4-(N-Mesylamino)-2,3-unsaturated- α-O-glycosides via a New Glycal-Derived Vinyl α-N-(Mesyl)-aziridine
摘要:
N-Mesyl aziridine 7 alpha(1) a new activated vinyl aziridine derived from D-glucal, has been synthesized by cyclization of trans-NO-dimesylate 6 with t-BuOK in anhydrous benzene. The reaction of 7 alpha with alcohols, phenol, and monosaccharides (O-nucleophiles) leads to the corresponding 4-N(mesylam ino)-2,3-unsaturated-aglycos ides and disaccharides through a completely regioselective 1,4-addition process that proceeds with high or complete alpha-stereoselectivity.