申请人:——
公开号:US20040171837A1
公开(公告)日:2004-09-02
The invention relates to a process for preparing a 4-amino-4-phenylpiperidine (I):
1
in which R is hydrogen or a (C
1
-C
3
)alkyl group, characterized in that a 1-protected 4-piperidone (II):
2
in which Pr′ represents a removable N-protecting group, is treated sequentially first with an alkali metal cyanide and then with an amine ENHPr″ (III) in which E represents a group R′=(C
1
-C
3
)alkyl, or an N-protecting group and Pr″ is an N-protecting group, the protecting group(s) being removable under the same conditions as Pr′; then the compound thus obtained (IV) is subjected to a Grignard reaction with a phenylmagnesium halide, the two or three protecting groups are removed from the compound thus obtained (V) and compound (I) is isolated or in the form of the free base, which is converted into one of its salts.
该发明涉及一种制备4-氨基-4-苯基哌啶(I)的过程:其中R是氢或(C1-C3)烷基基团,其特征在于首先处理一种1-保护的4-哌啶酮(II):其中Pr'代表可去除的N-保护基团,然后依次与碱金属氰化物和胺ENHPr″(III)进行反应,其中E代表基团R′=(C1-C3)烷基,或N-保护基团,Pr″是N-保护基团,保护基团可在与Pr'相同的条件下去除;然后将得到的化合物(IV)进行格氏试剂反应,与苯基镁卤化物反应,从得到的化合物(V)中去除两个或三个保护基团,最终分离得到化合物(I)或其自由碱形式,随后将其转化为盐的其中一种形式。