Oxaunomycin (3) and its regioisomer (6) were synthesized by employing regioselective glycosidations of te C-7 hydroxyl group of 10-O-acetyl-β-rhodomycinone (16) and the C-10 hydroxyl group of the C-7, 9-O phenylboronate (14), respectively, in the presence of trimethylsilyl trifluoromethanesulfonate. Under the Konigs-Knorr conditions, 16 was also glycosidated to provide a fluoro sugar analog (7).
Oxaunomycin(3)及其区域异构体(6)通过采用选择性地对10-O-乙酰-β-
红霉素酮(16)的C-7羟基和C-7, 9-O-苯基
硼酸酯(14)的C-10羟基进行糖苷化反应合成,反应中使用了三甲基
硅基三
氟甲基磺酸盐。在Konigs-Knorr条件下,16也进行了糖苷化反应,得到了一种
氟糖类似物(7)。