A systematic study of the N-substitution reactions of 3-substituted pyrazoles under basic conditions has been undertaken. Regioselective N1-alkylation, -arylation, and -heteroarylation of 3-substituted pyrazoles have been achieved using K2CO3-DMSO. The regioselectivity is justified by the DFT calculations at the B3LYP/6-31G**(d) level. A consistent steric effect on chemical shift has been observed
对3-取代的吡唑在碱性条件下的N-取代反应进行了系统的研究。使用K 2 CO 3 -DMSO已经实现了3-取代的吡唑的区域选择性N1-烷基化,-芳基化和-杂芳基化。通过在B3LYP / 6-31G **(d)水平上的DFT计算可以证明区域选择性。对于N-烷基吡唑类似物,已经观察到对化学位移的一致的空间效应。已获得二十五个X射线晶体学结构,以确认主要产品的区域化学。