作者:Mateo Berton、Rossella Mello、Paul G. Williard、María Elena González-Núñez
DOI:10.1021/jacs.7b08450
日期:2017.12.6
Lithium β-ketocarboxylates 1(COOLi), prepared by the reaction of lithium enolates 2(Li+) with carbon dioxide, readily undergo decarboxylative disproportionation in THF solution unless in the presence of lithium salts, in which case they are indefinitely stable at room temperature in inert atmosphere. The availability of stable THF solutions of lithium β-ketocarboxylates 1(COOLi) in the absence of carbon
β-酮基羧酸锂 1(COOLi),由烯醇锂 2(Li+) 与二氧化碳反应制备,在 THF 溶液中很容易发生脱羧歧化反应,除非在锂盐存在的情况下,在这种情况下,它们在室温下无限稳定惰性气氛。在不存在二氧化碳的情况下,β-酮基羧酸锂 1(COOLi) 的稳定 THF 溶液的可用性允许与氮碱和烷基卤化物 3 发生反应,在酸性水解后得到 α-烷基酮 1(R)。因此,该序列代表使用二氧化碳作为可去除的导向基团,用于烯醇化锂 2(Li+) 的选择性单烷基化。