A novel method for the preparation of a compound of formula (I) from an N-protected-D-mannosamine. A compound of formula (I) is a useful intermediate for the preparation of kiftnensine, a potent and selective mannosidase inhibitor. The method includes protecting the hydroxyl group at the C-6 position of an N-protected-D-mannosamine, to give a 6-O-protected-N-protected-D-mannosamine; reducing the C-1 anomeric carbon atom of the 6-O-protected-N-protected-D-mannosamine to give a 6-O-protected-N-protected-D-mannitol; protecting the four hydroxyl groups of the 6-O-protected-N-protected-D-mannitol; and removing the nitrogen atom protecting group and optionally removing the C-6 oxygen atom protecting group to give the compound of formula (I):
1
where R
1
and R
2
are each independently protecting groups which, together with the oxygen atoms to which they are attached, form a 5-, 6-, 7- or 8-membered ring; and R
3
is hydrogen or a protecting group.
一种从N-保护-D-甘露胺制备式(I)化合物的新方法。式(I)化合物是制备基夫特尼辛的有用中间体,基夫特尼辛是一种有效且选择性的
甘露糖苷酶
抑制剂。该方法包括保护N-保护-D-甘露胺的C-6位置的羟基,得到一个6-O-保护的N-保护-D-甘露胺;还原6-O-保护的N-保护-D-甘露胺的C-1异构碳原子,得到一个6-O-保护的N-保护-D-
甘露醇;保护6-O-保护的N-保护-D-
甘露醇的四个羟基;去除氮原子保护基并可选择性地去除C-6氧原子保护基,得到式(I)化合物:其中R1和R2分别是保护基,它们与其附着的氧原子一起形成一个5、6、7或8-成员环;R3是氢或保护基。