| 摘要 |
The present invention concerns a process for the preparation of a compound of formula (I): the process comprising a. reducing aldehyde of formula (III): with an alkali metal borohydride in ethanol to give compound of formula (IV): b. halogenating a compound of formula (IV) with a halogenating agent to form a compound of formula (V): wherein X is halogen; and, c. reducing compound or formula (V) with zinc and acetic acid to produce a compound of formula (I). |
