作者:Di Xu、Lena Frank、Tina Nguyen、Andreas Stumpf、David Russell、Remy Angelaud、Francis Gosselin
DOI:10.1055/s-0039-1690160
日期:2020.4
A highly regioselective Mg-catalyzed alkylation of 3-substituted pyrazoles has been developed to provide N2-alkylated regioisomers. Using α-bromoacetates and acetamides as alkylating agents, this new method was applied to a variety of 3-substituted and 3,4-disubstituted pyrazoles to produce the N2-alkylated products with high regioselectivities ranging from 76:24 to 99:1 and 44–90% yields.
已开发出高度区域选择性的 Mg 催化的 3-取代吡唑烷基化,以提供 N2-烷基化区域异构体。使用α-溴乙酸酯和乙酰胺作为烷基化剂,将这种新方法应用于各种3-取代和3,4-二取代吡唑,以制备具有76:24至99:1和44的高区域选择性的N2-烷基化产物–90% 的产量。