Continuous Flow Preparation of (Hetero)benzylic Lithiums via Iodine–Lithium Exchange Reaction under Barbier Conditions
作者:Niels Weidmann、Johannes H. Harenberg、Paul Knochel
DOI:10.1021/acs.orglett.0c01991
日期:2020.8.7
benzylic lithiums via an iodine–lithium exchange reaction on benzylic iodides performed in continuous flow using tBuLi as the exchange reagent. The resulting benzylic lithium species are trapped in situ by carbonyl electrophiles under Barbier conditions, resulting in benzylic secondary and tertiary alcohols. This flow procedure further allows the generation of highly reactive heterobenzylic lithium compounds
在这里,我们报告了通过使用t BuLi作为交换试剂在连续流动下进行的苄基碘化物上的碘-锂交换反应生成苄基锂。在Barbier条件下,羰基亲电试剂将所得的苄基锂物质原位捕获,从而生成苄基仲和叔醇。该流动程序进一步允许产生高反应性的杂苄基锂化合物,其在间歇条件下难以产生。无需进一步优化,就可以进行总体放大。