Patent ID: 8378119

Claim:
A method for producing a salt formed from an optically active carboxylic acid and a compound of formula (5-1): or formula (5-2): wherein: n is an integer of 2 to 5; R 1 is a C1 to C4 alkyl group which may have a substituent or an aryl group which may have a substituent; and R 4 is a benzyl group, a benzhydryl group, or a trityl group, wherein phenyl group thereof may have, as a substituent, one or more groups selected from the group consisting of a nitro group, an alkoxy group, and a halogen atom, wherein said method comprises treating a compound of formula (5): wherein n, R 1 , and R 4 are the same as defined above with an optically active carboxylic acid in an organic solvent.