申请人:Engel Stefan
公开号:US20080183021A1
公开(公告)日:2008-07-31
A process for preparing substituted biphenyls
in which
R
1
=nitro, amino or NHR
3
,
R
2
=CN, NO
2
, halogen, C
1
-C
6
-alkyl, C
2
-C
6
-alkenyl, C
2
-C
6
-alkynyl, C
1
-C
6
-alkoxy, C
1
-C
6
-haloalkyl, C
1
-C
6
-alkylcarbonyl or phenyl,
R
3
=C
1
-C
4
-alkyl, C
2
-C
4
-alkenyl or C
2
-C
4
-alkynyl,
m=1 or 2; n=0 to 3,
which comprises reacting a compound II
in the presence of a base and of a palladium catalyst selected from the group of: a) palladium-triarylphosphine or -trialkylphosphine complex with palladium in the zero oxidation state, b) salt of palladium in the presence of triarylphospine or trialkylphosphine as a complex ligand or c) metallic palladium applied to support if appropriate,
in the presence of triarylphosphine or trialkylphosphine, in a solvent, with a diphenylborinic acid (III)
制备取代联苯的方法,其中R1 = 硝基,氨基或NHR3,R2 = CN,NO2,卤素,C1-C6烷基,C2-C6烯基,C2-C6炔基,C1-C6烷氧基,C1-C6卤代烷基,C1-C6烷基羰基或苯基,R3 = C1-C4烷基,C2-C4烯基或C2-C4炔基,m = 1或2; n = 0到3。该方法包括在碱和钯催化剂的存在下,通过在溶剂中与二苯基硼酸(III)反应,使用以下钯催化剂之一:a)钯-三芳基膦或三烷基膦配合物,其中钯处于零氧化态,b)在三芳基膦或三烷基膦存在下,以配合物配体的形式存在的钯盐或c)适当的载体上的金属钯,在三芳基膦或三烷基膦的存在下。