申请人:——
公开号:US20030153764A1
公开(公告)日:2003-08-14
The present invention provides a process for preparing N-protected-4-substituted piperidines of formula (I) wherein Pg represents a suitable nitrogen protecting group; X represents a heterocycle, substituted heterocycle, substituted alkenyl or substituted aryl wherein the substituted heterocycle, substituted alkenyl or substituted aryl are substituted with from 1 to 3 suitable activating groups; and R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, and R
8
each independently represent an alkyl, alkenyl, cycloalkyl, aryl, substituted aryl, heterocycle, or substituted heterocycle, comprising treating a compound of formula (II) wherein the substituents are defined as above, with triethylsilane and trifluoroacetic acid.
本发明提供了一种制备式(I)的 N-保护-4-取代哌啶的工艺 其中 Pg 代表合适的氮保护基团;X 代表杂环、取代的杂环、取代的烯基或取代的芳基, 其中取代的杂环、取代的烯基或取代的芳基被 1 至 3 个合适的活化基团取代;以及 R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
和 R
8
各自独立地代表烷基、烯基、环烷基、芳基、取代芳基、杂环或取代杂环,包括用三乙基硅烷和三氟乙酸处理式(II)化合物,其中取代基定义如上。