The invention relates to a process for the preparation of spiro[(4-cyclohexanone)-[3H]indol]-2′[1′H]-one derivatives of the general formula I
1
wherein R
1
and R
2
independently stand for hydrogen, C
1-4
alkyl, C
1-4
alkoxy, C
1-4
alkylthio, C
1-4
polyfluoroalkyl, C
1-4
polyfluoroalkoxy, C
3-7
cycloalkyloxy, C
3-7
cycloalkylthio, phenoxy, benzyloxy or nitro group—,
characterized by reacting an indolin-2-one derivative of the general formula II
2
wherein R
1
and R
2
are as defined above—with a compound capable for introducing a protective group, selected from 2-tetrahydropyranyl, 1-diethoxy-methylene or C
1-4
alkoxycarbonylethyl group, coupling the compound of general formula III,
3
thus obtained—wherein R
1
and R
2
are as defined above and A stands for a protective group, selected from 2-tetrahydropyranyl, 1-diethoxy-methylene or C
1-4
alkoxycarbonylethyl group—with an acrylic acid C
1-4
ester, cyclizing the resulting compound of the general formula IV
4
wherein R
1
, R
2
and A are as defined above, R
3
stands for C
1-4
alkyl group—, eliminating the —COOR
3
group and the A protective group of the keto-ester of general formula V
5
wherein R
1
, R
2
, R
3
and A are as defined above, optionally without isolation of the compounds of the general formulae IV
6
7
本发明涉及一种通式 I 的螺[(4-
环己酮)-[3H]
吲哚]-2′[1′H]-酮衍
生物的制备方法
1
其中 R
1
和 R
2
分别代表氢、C
1-4
烷基
1-4
烷氧基
1-4
烷
硫基,C
1-4
多氟烷基,C
1-4
多氟烷氧基,C
3-7
环烷氧基,C
3-7
环烷基
硫基、苯氧基、苄氧基或硝基、
其特征在于将通式 II 的
吲哚啉-2-酮衍
生物反应为
2
其中 R
1
和 R
2
是如上定义的--可引入保护基团的化合物,保护基团选自 2-
四氢吡喃基、1-二乙氧基亚甲基或 C
1-4
烷氧羰基乙基,将通式 III 的化合物偶联、
3
其中 R
1
和 R
2
代表保护基团,选自 2-
四氢吡喃基、1-二乙氧基亚甲基或 C
1-4
烷氧基羰基乙基--
丙烯酸 C
1-4
酯,使所得通式 IV 的化合物环化
4
其中 R
1
, R
2
和 A 如上定义,R
3
代表 C
1-4
烷基,去掉 -COOR
3
基团和通式 V 的
酮酯的 A 保护基团
5
其中 R
1
, R
2
, R
3
和 A 如上所定义,通式 IV 的化合物可选择不分离
6
7