作者:Sabine Choppin、Philippe Gros、Yves Fort
DOI:10.1002/1099-0690(200102)2001:3<603::aid-ejoc603>3.0.co;2-2
日期:2001.2
We have shown that the BuLi/LiDMAE reagent promotes the clean and regioselective C2 lithiation of 3- and 4-chloropyridines, while other reagents such as LDA or BuLi/TMEDA lead to classical ortho lithiation products or mixtures of regioisomers. The method was successfully applied to the preparation of various reactive 2,3- and 2,4-disubstituted pyridines.
我们已经证明 BuLi/LiDMAE 试剂促进了 3- 和 4- 氯吡啶的清洁和区域选择性 C2 锂化,而其他试剂如 LDA 或 BuLi/TMEDA 导致经典的邻位锂化产物或区域异构体的混合物。该方法已成功应用于各种活性2,3-和2,4-二取代吡啶的制备。