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Communication | Special issue | Vol 15, No. 1, 1981, pp.265-269
Published online, 1st January, 1970
DOI: 10.3987/S-1981-01-0265
Ring Transformations of 6H-Cyclopropa[5a,6a]pyrazolo[1,5-a]pyrimidine

Takushi Kurihara,* Tsutomu Tani, and Keiko Nasu

*Faculty of Pharmaceutical Science, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan

Abstract

The ring transformations of 5a-acetyl-6a-carbethoxy-5a,6a-dihydro-6H-cyclopropa[5a,6a]pyrazolo[1,5-a]pyrimidine-3-carbonitrile (2) and the corresponding 5-methyl derivative (3) into pyrazolylpyrroles (7 and 8), pyrazolopyrimidine (10), and pyrazolylpyridone (12) under the basic, acidic, and neutral condition are described.