| abstract |
8-(3-Pentylamino)-2-methyl-3-(2-chloro-4-methoxyphenyl)-6,7-dihydro-5H-cyclopenta[d]pyrazolo[1,5-a]pyrimidine methanesulfonate, which is novel, and a process for producing an intermediate for the compound. 8-(3-Pentylamino)-2-methyl-3-(2-chloro-4-methoxyphenyl)-6,7-dihydro-5H-cyclopenta[d]pyrazolo[1,5-a]pyrimidine methanesulfonate is a compound having highly excellent thermal stability. The novel production process enables a compound represented by the general formula (I): (I) (wherein Ar represents an optionally substituted benzene ring, etc.; and R1 represents C1-8 alkyl, C2-8 alkenyl, C2-8 alkynyl, etc.), which is an intermediate, to be efficiently produced in a high yield. |