Patent ID: 8686189

Claim:
A process for producing an acid adduct salt of a compound represented by formula (VI-I): wherein R 1 represents a C2-C5 alkoxycarbonyl group and R 3 represents a dimethylcarbamoyl group, said process comprising: treating a compound represented by formula (A) with an azide in the presence or absence of a phase-transfer catalyst to obtain a mixture comprising a compound represented by formula (V-I) and a compound represented by formula (B): subjecting said mixture to hydrogenolysis in a C1-C4 alcoholic solvent in the presence of a metallic catalyst and a hydrogen source to obtain a mixture comprising the compound represented by formula (VI-I) and a compound represented by formula (C): wherein R 1 and R 3 for each of formulas (A), (V-I), (B) and (C) have the same meanings as defined for formula (VI-I) and R 2 of formula (A) represents a C1-C6 alkyl group, a C1-C6 halogenoalkyl group, or a phenyl group which may have a halogen atom, a C1-C6 alkyl group, a C1-C6 halogenoalkyl group, a C1-C6 alkoxy group, a nitro group, a carbamoyl group, or a cyano group, followed by adding oxalic acid, to obtain an acid adduct salt of the compound represented by formula (VI-I).