申请人:Wolleb Heinz
公开号:US20050032875A1
公开(公告)日:2005-02-10
A process for the preparation of compounds of formula (I) wherein R
1
is unsubstituted or substituted C
1
-C
8
alkyl, R
2
, R
3
, R
4
and R
5
are each independently of the others hydrogen, unsubstituted or substituted C
1
-C
8
alkyl, C
1
-C
8
alkoxy, phenoxy or benzyloxy, or halogen, Y
1
and Y
2
are each independently of the other hydrogen or a protecting group, or Y
1
and Y
2
together form a protecting bridge, and X
1
is hydrogen, an organic radical or a cation, in which process a compound of formula (II) wherein R
1
R
2
, R
3
, R
4
and R
5
are as defined above and Z
1
is a leaving group, is reacted, in the presence of a catalytically effective amount of a palladium catalyst, with a compound of formula (III) wherein R
6
is hydrogen, bromine, chlorine, iodine, —OSO
2
CF
3
, —COCI, —B(OH)
2
or a mono- or di-ester derived from —B(OH)
2
, Y
3
and Y
4
are each a protecting group, or Y
3
and Y
4
together form a protecting bridge, and X
1
is as defined above, to form a compound of formula (IV) and if desired the radicals Y
3
and Y
4
are converted into the radicals Y
1
and Y
2
where Y
1
and Y
2
are hydrogen.
一种制备式为(I)化合物的方法,其中R1是未取代或取代的C1-C8烷基,R2、R3、R4和R5各自独立地为氢、未取代或取代的C1-C8烷基、C1-C8烷氧基、苯氧基或苄氧基,或卤素,Y1和Y2各自独立地为氢或保护基,或Y1和Y2共同形成保护桥,X1为氢、有机基团或阳离子,在该方法中,式为(II)的化合物与式为(III)的化合物反应,其中R1、R2、R3、R4、R5和X1如上所定义,Z1为离去基团,存在催化作用的钯催化剂的情况下,其中R6为氢、溴、氯、碘、-OSO2CF3、-COCI、-B(OH)2或由-B(OH)2衍生的单酯或双酯,Y3和Y4各自为保护基,或Y3和Y4共同形成保护桥,X1如上所定义,形成式为(IV)的化合物,如果需要,将基团Y3和Y4转化为基团Y1和Y2,其中Y1和Y2为氢。