Method for producing (2S,4R,9S)-octahydro-1H-indole-2-carboxylic acid and intermediate products therefor
申请人:BASF Aktiengesellschaft
公开号:US06559318B1
公开(公告)日:2003-05-06
Described is a process for the preparation of (2S, 4R, 9S)-octahydro-1H-indole-2-carboxylic acid, comprising
a) reacting a compound of the formula I
(R1O)2CH—CH2—CH(OR2)2 I
wherein R1 and R2 may be the same or different and represent each a C1-4-alkyl group, with water in the presence of an acidic catalyst,
b) subjecting the obtained 3,3-dialkoxypropionaldehyde of formula II
(R2O)2CH—CH2—CHO II
to a Henry-reaction with nitromethane,
c) subjecting the obtained 4,4-dialkoxy-1-nitro-4-butanol of formula III
(R1O)2CH—CH2—CHOH—CH2—NO2 III
to a dehydration
d) converting the obtained nitroolefin IV with the aid of a Diels-Alder reaction into the corresponding trans-4-(2,2-dialkoxyethyl)-5-nitro-1-caclohexene V
e) hydrogenating the obtained substance V into the corresponding trans-4-(2,2-dialkoxyethyl)-5-amino-1-cyclohexane VI
f) subjecting the compound VI to a resolution of racemate and obtaining the (1S, 2R)-1-amino-2-(2,2-dialkoxyethyl)-cyclohexane VII in enantiomerically pure form by enzymatic racemate resolution,
g) hydrolysing the obtained compound VII to the corresponding aldehyde VIII
h) converting the obtained aldehyde into the corresponding nitrite IX by reaction with cyanide ions and
i) saponifying this nitrile to the (2S, 4R, 9S)-octahydro-1H-indole-2-carboxylic acid.
描述了一种制备(2S, 4R, 9S)-辛氢-1H-吲哚-2-羧酸的过程,包括a)在酸性催化剂存在下,将具有以下结构的化合物与水反应:I(R1O)2CH—CH2—CH(OR2)2,其中R1和R2可以相同也可以不同,分别代表C1-4烷基基团,b)将获得的II(R2O)2CH—CH2—CHO的3,3-二烷氧基丙醛进行亨利反应,c)将获得的III(R1O)2CH—CH2—CHOH—CH2—NO2的4,4-二烷氧基-1-硝基-4-丁醇脱水,d)利用Diels-Alder反应将获得的硝基烯烃IV转化为相应的反式-4-(2,2-二烷氧基乙基)-5-硝基-1-环己烯,e)将获得的物质V氢化为相应的反式-4-(2,2-二烷氧基乙基)-5-氨基-1-环己烷,f)将化合物VI进行外消旋分离,通过酶消旋分离获得对映纯的(1S, 2R)-1-氨基-2-(2,2-二烷氧基乙基)-环己烷VII,g)水解获得的化合物VII得到相应的醛VIII,h)将获得的醛通过与氰根离子反应转化为相应的亚硝酸酯IX,i)皂化此腈得到(2S, 4R, 9S)-辛氢-1H-吲哚-2-羧酸。