[Mo(CO)6]-induced reactions of 1-acyl-3,5-disubstituted pyrazoles underwent N–N bond cleavage and subsequent cyclocondensation to give pyrimidines as well as deacylation to give 3,5-disubstituted pyrazoles. Under similar conditions, 1,3,5-trisubstituted pyrazoles, which have no electron-withdrawing substituent on N1, gave no product, except for the starting materials.
在[Mo(CO)6]诱导下,1-酰基-3,5-二取代
吡唑发生 N-N 键裂解,随后环缩合生成
嘧啶,以及脱酰基生成 3,5-二取代
吡唑。在类似条件下,1,3,5-三取代
吡唑(N1 上没有抽电子取代基)除起始原料外没有生成物。