申请人:——
公开号:US20030187290A1
公开(公告)日:2003-10-02
A process for preparing bicyclic 1,3-diketones of the formula I
1
where
R
1
, R
2
, R
3
and R
4
are hydrogen, C
1
-C
4
-alkyl, C
1
-C
4
-alkoxy-carbonyl, halogen, cyano, nitro, C
1
-C
4
-alkylthio, C
1
-C
4
-alkylsulfenyl or C
1
-C
4
-alkylsulfonyl and
Z is C
1
-C
4
-alkylene, O, S, N—R
5
where
R
5
is C
1
-C
4
-alkyl or C
1
-C
4
-alkylcarbonyl,
which comprises
a) reacting a bicyclic olefin of the formula II with haloform in the presence of a base to give the ring-expanded product of the formula III
2
where
R
1
-R
4
and Z are as defined above and
X is halogen;
b) hydrolyzing the allylic halogen of the compound of the formula III to the allyl alcohol of the formula IV
3
c) oxidizing the allyl alcohol of the formula IV to the unsaturated ketone of the formula V
4
d) reacting the ketone of the formula V with a nucleophilic ion Y
−
which stabilizes a negative charge to give the ketone of the formula VI
5
e) hydrolyzing the ketone of the formula VI to the bicyclic
1,3
-diketone of the formula I,
novel intermediates and novel processes for preparing these intermediates are described.
一种制备公式I1中R1、R2、R3和R4为氢、C1-C4烷基、C1-C4烷氧羰基、卤素、氰基、硝基、C1-C4烷基硫基、C1-C4烷基烯基或C1-C4烷基磺酰基,Z为C1-C4烷基亚甲基、氧、硫或N-R5,其中R5为C1-C4烷基或C1-C4烷基羰基的双环1,3-二酮的方法,包括a)在碱存在下,将公式II的双环烯烃与卤代甲烷反应,得到公式III的环扩展产物,其中R1-R4和Z如上定义,X为卤素;b)将公式III化合物的烯丙基卤素水解为公式IV的烯丙醇;c)将公式IV的烯丙醇氧化为公式V的不饱和酮;d)将公式V的酮与稳定负电荷的亲核离子Y-反应,得到公式VI的酮;e)将公式VI的酮水解为公式I的双环1,3-二酮。描述了新的中间体和制备这些中间体的新方法。