申请人:Santagostino Marco
公开号:US20070112191A1
公开(公告)日:2007-05-17
A process for making a compound of formula 1
or a salt thereof, wherein:
R
1
and R
2
are each independently H, halogen, or C
1-4
-alkyl, or R
1
and R
2
together are C
1-6
-alkylene; and
R
3
is H, halogen, OH, C
1-4
-alkyl, or O—C
1-4
-alkyl, the process comprising:
(a) reacting a compound of formula 6
wherein R
4
is benzyl, diphenylmethyl, or trityl, each optionally substituted at, if available, an aryl group or an aliphatic carbon atom, with a compound of formula 7
or a salt thereof, to obtain a compound of formula 5, or a salt thereof
(b) reducing the nitro group of the compound of formula 5 to an amine group and mesylating this amine group and cleaving the protecting group during the reduction step or after the mesylation step to obtain the compound of formula 1.
制备化合物1或其盐的方法,其中:R1和R2分别独立为H、卤素或C1-4-烷基,或者R1和R2一起是C1-6-烷基;而R3是H、卤素、羟基、C1-4-烷基或O—C1-4-烷基,该方法包括:(a) 与化合物6反应,其中R4为苄基、二苯甲基或三苯甲基,每个都可以在芳香族基团或脂肪碳原子上选择性地取代,以获得化合物5或其盐;(b) 还原化合物5的硝基基团为胺基,并在还原步骤期间或在甲磺酰化步骤之后将该胺基甲磺酰化并裂解保护基,以获得化合物1。