申请人:Bacchi Sergio
公开号:US20070232808A1
公开(公告)日:2007-10-04
The present invention relates to a novel process, useful for preparing key intermediates of formula (I) in the synthesis of various compounds, among them compounds which are potent and specific antagonists of D3 receptors,
in which
X may be Nitrogen or Sulfur;
Het means aryl or heteroaryl; each of which may be substituted by 1 to 4 groups J selected from:
halogen, C1-C6 alkyl C1-C6 alkoxy, halo C1-C6 alkyl C2-C6 alkenyl, C2-C6 alkynyl, halo C1-C6 alkoxy, —C(O)R
1
, nitro, hydroxy, —NR
2
R
3
, cyano or a group Z;
R
1
is a C1-C4 alkyl —OR
3
or —NR
3
R
4
;
R
2
is hydrogen or C1-C6 alkyl;
R
3
is hydrogen or C1-C6 alkyl;
R is H, C1-C6 alkyl aryl, benzyl; each of which may be substituted by 1 to 4 groups J;
according to the following Scheme 1:
in which
step a means a reaction in basic conditions of compounds (IIA) with 3-thiosemicarbazide derivatives, followed by a treatment with an inorganic base and n-propane phosphonic cyclic anhydride and final pH adjustment with inorganic acids to give compounds of formula (II).
该发明涉及一种新型工艺,用于制备公式(I)中的关键中间体,在合成各种化合物中起作用,其中这些化合物是D3受体的有效和特异性拮抗剂,
其中
X 可以是氮或硫;
Het 表示芳基或杂环芳基;每个可以被1至4个J基团取代,所述J基团选自:
卤素,C1-C6烷基,C1-C6烷氧基,卤代C1-C6烷基,C2-C6烯基,C2-C6炔基,卤代C1-C6烷氧基,—C(O)R
1
,硝基,羟基,—NR
2
R
3
,氰基或Z基团;
R
1
是C1-C4烷基,—OR
3
或—NR
3
R
4
;
R
2
是氢或C1-C6烷基;
R
3
是氢或C1-C6烷基;
R 是H,C1-C6烷基芳基,苄基;每个可以被1至4个J基团取代;
根据以下Scheme 1:
其中
步骤a表示化合物(IIA)在碱性条件下与3-硫代脲衍生物发生反应,然后经过与无机碱和正丙磷酸环状酐的处理,并最终通过无机酸进行pH调节,得到公式(II)的化合物。