Addition of novel benzylmagnesium “ate” complexes of BnR2MgLi type to 2-(thio)pyridones and related compounds
作者:Jacek G. Sośnicki、Tomasz Idzik、Aleksandra Borzyszkowska、Emil Wróblewski、Gabriela Maciejewska、Łukasz Struk
DOI:10.1016/j.tet.2016.12.024
日期:2017.2
Novel benzylation reagents BnR2MgLi were obtained by mixing benzylmagnesium chloride (BnMgCl) and appropriate organolithium compounds (RLi). As BnR2MgLi complexes are more nucleophilic than the parent Grignard compound they enabled regioselective C6-addition to electrophilic N-substituted 2-(thio)-pyridones and C4-addition to poorly reactive NH 2-(thio)pyridones in high and good yields, respectively
通过混合氯化苄基镁(BnMgCl)和适当的有机锂化合物(RLi)获得新型苄基化试剂BnR 2 MgLi。由于BnR 2 MgLi复合物比亲本的格利雅(Grignard)化合物更具亲核性,因此它们能够以高产率和高收率将区域选择性C6加成至亲电N-取代的2-(硫代)-吡啶酮中,并将C4加成至反应性较差的NH 2-(硫代)吡啶酮中。 , 分别。因此,描述了这些新试剂在有效合成6-苄基-3,6-二氢-和4-苄基-3,4-二氢吡啶-2-2 (1 H)-酮中的应用。还提出了BnR 2 MgLi在1,6-加成其他六种α,β-不饱和体系的其他亲电试剂中更广泛应用的前景。