申请人:Muller Marc
公开号:US20110178291A1
公开(公告)日:2011-07-21
A process for manufacturing a compound of Formula (I) which has cis-conformation and wherein R1 represents a 1-phenyl-C
1
-C
4
alkyl or 1-naphthyl-C
1
-C
4
alkyl group, wherein the phenyl or naphthyl moiety of R1 is unsubstituted or substituted with one or more C
1
-C
4
alkoxy groups and the carbon atoms in 2-, 3-, and/or 4-position of the alkyl part of R1 are, independently of the phenyl or naphthyl moiety of R1 and independently of one another, unsubstituted or substituted with C
1
-C
4
alkoxy and/or silyloxy or, preferably, are unsubstituted or substituted with one C
1
-C
4
alkoxy group and/or silyloxy group per carbon atom, and R2 represents a C
1
-C
6
alkyl group or an unsubstituted or substituted benzyl group, in which process a compound of Formula (II) wherein R3 represents a C
1
-C
6
alkyl group or an unsubstituted or substituted benzyl group, and R1 and R2 have the same meaning as in formula (I); is treated with a base at a temperature of 0° C. or less in a liquid aprotic solvent for a time period sufficient to obtain the compound of formula (I).
制备式(I)化合物的过程,其具有顺式构象,其中R1代表1-苯基-C1-C4烷基或1-萘基-C1-C4烷基基团,其中R1的苯基或萘基部分未取代或取代有一个或多个C1-C4烷氧基团,并且R1的烷基部分中2-,3-和/或4-位置的碳原子,独立于R1的苯基或萘基部分,以及彼此独立地,未取代或取代有C1-C4烷氧基和/或硅烷氧基,或者更好地,未取代或取代有每个碳原子一个C1-C4烷氧基和/或硅烷氧基,而R2代表C1-C6烷基或未取代或取代的苄基基团,在该过程中,式(II)化合物在无极性液体溶剂中,以0℃或更低的温度和碱处理足够时间,以获得式(I)化合物。