groups were protected as benzyl ethers. Removal of the trityl group, followed by treatment with diethylaminosulfur trifluoride gave the 9-deoxy-9-fluoro derivative, and deprotection N-acetyl-9-deoxy-9-fluoroneuraminic acid (8). In another procedure, coupling of 2-acetamido-2,6-dideoxy-6-fluoro-D-glucopyranose with potassium di(tert-butyl) oxaloacetate, followed by hydrolysis and decarboxylation gave
将5-乙酰
氨基-3,5-二脱氧-2-O-甲基-D-
甘油-
D-半乳糖-2-壬基
吡喃酮酸酯转化为9-O-三苯甲基衍
生物,并将剩余的羟基保护为苄基醚。除去三苯甲基,然后用
二乙基氨基三
氟化
硫处理,得到9-脱氧-9-
氟衍
生物和脱保护的N-乙酰基-9-脱氧-9-
氟神经
氨酸(8)。在另一种方法中,将2-乙酰
氨基-2,6-二脱氧-6-
氟-
D-吡喃葡萄糖与
草酸二叔丁酯
钾偶合,然后
水解和脱羧,得到8。一些衍
生物具有活性作为
抑制剂。培养中小鼠乳腺腺癌(TA3)和L1210细胞的生长