in which R¹ and R² independently represent a hydrogen atom, a lower alkyl group or a lower haloalkyl group, or together form a C₂-C₁₀ alkylene group optionally substituted with a halogen by reducing an oxidepyrrole of the formula (2):
in which R¹ and R² are the same as defined above, with hydrogen in the presence of a catalyst.
摘要:
There is disclosed a process for producing an aromatic isothiocyanate derivative of the general formula [ I ]:
wherein X is chlorine or -O-; when X is chlorine, Y is -O- or -S-, and Z is hydrogen, alkyl, cycloalkyl, alkenyl, alkynyl, alkoxycarbonyl, cycloalkoxycarbonyl, carboxyalkyl, alkoxycarbonylalkyl or cycloalkoxycarbonylalkyl, or when X is -O-, X and Z are taken together to form -O-CH₂-CO-, and Y is -NR- wherein R is hydrogen, alkyl, cycloalkyl, alkenyl or alkynyl, which process including reacting an aromatic amine derivative of the general formula [II]:
wherein X, Y and Z are each as defined above, with carbon disulfide in the presence of a base in a nitrogen-containing polar solvent, and then with a chlorinated oxidizing agent.
摘要:
The present invention provides an advantageous method for producing an optically active chrysanthemic acid. Disclosed is a method for producing an optically active chrysanthemic acid whose trans isomer ratio and optical purity are improved, which comprises reacting chrysanthemic acid having a trans isomer ratio of not less than 50% and an optical purity of not less than 10% e.e. with an optically active organic amine to optically resolve said chrysanthemic acid.