Abstract
In connection with the study of the acetylation of 7-aminopyrazolo [1, 5-a] pyrimidines, further studies on the acetylation were investigated. Mono- and diacetates were obtained from the compounds being substituted with methyl-, Phenyl-, or ethoxy-carbonyl group at the C-6 position and only monoacetates being unsubstituted or with a cyano group at the C-6 position. The reason for this was confirmed to be the steric effect of the substituents at the C-6 position. Various 7-acylamino (XXXVII∼XL, XLII∼XLVI), 7-alkylamino (XLI, LVIII∼LXVI), and 7-H pyrazolo [1, 5-a] pyrimidines (LIII∼LV) were also derived.
