A process of making entecavir comprising converting a compound of formula (M5)
to entecavir,
wherein the two PGs on the formula (M5) are taken together to form an optionally substituted six- or seven-member cyclic ring.
一种制备
恩替卡韦的方法,包括将式(M5)的化合物转化为
恩替卡韦,其中式(M5)上的两个
PG(保护基)结合在一起形成一个可选取代的六元或七元环。