摘要:
The present invention provides a process for preparation of the compound of formula (VI), wherein each symbol is as defined in the specification, without using any intermediate compound showing mutagenicity. The process comprises salt formation of the intermediate compound of formula (I) with acid to enable optical resolution to isolate the intermediate compound of formula (II) in a stereo-selective manner.
摘要:
A process for the preparation of a compound of formula (I):
wherein R 1 is each independently halogen, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 haloalkyl, C1-C6 haloalkoxy or C1-C6 alkylcarbonyl, R 3 is C1-C6 alkyl; C3-C8 cycloalkyl; or phenyl optionally substituted with one or more substituents selected from the group consisting of halogen, C1-C6 alkyl; C1-C6 alkoxy, C1-C6 haloalkyl and C1-C6 haloalkoxy, n is an integer of 0 to 2, X is S atom or O atom,
its salt or solvate thereof characterized by reacting a compound of formula (IV):
wherein R 1 , n and X have the same meaning as defined above, and R 2 is C1-C6 alkyl; C1-C6 haloalkyl; or phenyl optionally substituted with one or more substituents selected from the group consisting of halogen, C1-C6 alkyl, C1-C6 alkoxy, C1-C6 haloalkyl, C1-C6 haloalkoxy and nitro,
with a compound of formula (V):
wherein R 3 has the same meaning as defined above.