Tandem intramolecular carbolithiation–transmetallation: from lithium to copper or boron chemistry
作者:Rosa Ortiz、Miguel Yus
DOI:10.1016/j.tet.2004.12.047
日期:2005.2
with eletrophiles, such as allylic or propargylic halides, acyl chlorides or α,β-unsaturated carbonyl compounds giving the expected compounds 6–10, which are not possible to be obtained directly from the organolithium 3. On the other hand, lithium/boron transmetallation affords the corresponding alkylboronic acid 11 which, after palladium-catalysed Suzuki–Miyaura cross-coupling reaction with different
来自有机锂中间体3的锂/铜金属转移(通过无环有机锂2的分子内碳锂化获得,通过氯-锂交换生成)得到相应的有机铜中间体5。与eletrophiles,如烯丙基或炔丙基卤化物,酰基氯或α,给出预期的化合物β不饱和羰基化合物该中间体进行反应6 - 10,这是不能够直接从有机锂获得3。另一方面,锂/硼金属转移反应生成相应的烷基硼酸11在钯催化的Suzuki-Miyaura与不同的芳基溴化物进行交叉偶联反应后,预期产物12的收率适中,而相应的Ullman二元同质偶联产物是主要的副产物。