| 摘要 |
Prepn. of new 5,5,7-trimethyl-3H,5H-1,2,4-triazolo (1,5-a)pyrimidines of formula (I) comprises refluxing a 1,4-dihydro-1-acylamino-2-methyl thio- pyrimidine hydriiodide (II) in glacial acetic acid with ammonium acetate or alkylammonium acetate, with elimination of MeSH and water. R1 is 1-9C alkyl, phenyl (opt. mono- or polysubstd. by alkyl,alkoxy, Cl, NO2 or NH2) or substd. amino or aminoalkyl; R2 is H, 1-5C alkyl or cycloalkyl.
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