作者:Bálint Nyulasi、András Németh、Márta Porcs-Makkay、József Kupai、Gyula Lukács、Gyula Simig、Balázs Volk
DOI:10.1016/j.tet.2016.11.072
日期:2017.1
The lithio species thus generated were carboxylated to benzoic acids. Lithiations with BuLi occurred regioselectively ortho to the ketal substituent. When using BuLi/PMDTA, a regiodivergent behavior has generally been found in the lithiations. However, in some cases a significant selectivity was observed, enabling the preparation of the main regioisomer, exhibiting a new substitution pattern, with reasonable
氯和甲氧基取代的苯乙酮缩酮的用丁基锂锂(BuLi),并与金属化Ñ,Ñ,Ñ ',Ñ “,Ñ ” -五甲基络合丁基锂(丁基锂/ PMDTA)进行了研究。由此产生的锂硫基物质被羧化为苯甲酸。与丁基锂Lithiations发生区域选择性邻位的缩酮取代。使用BuLi / PMDTA时,通常在锂化中发现了区域发散行为。然而,在某些情况下,观察到显着的选择性,从而能够制备主要的区域异构体,并显示出新的取代模式,且产率合理。