Decarboxylative Allylation of Amino Alkanoic Acids and Esters via Dual Catalysis
作者:Simon B. Lang、Kathryn M. O’Nele、Jon A. Tunge
DOI:10.1021/ja508317j
日期:2014.10.1
temperature decarboxylative allylation of recalcitrant α-amino and phenylacetic allyl esters. This operationally simple process produces CO2 as the only byproduct and provides direct access to allylated alkanes. After photochemical oxidation, the carboxylate undergoes radical decarboxylation to site-specifically generate radical intermediates which undergo allylation. A radical dual catalysis mechanism
光氧化还原和钯催化的组合已被用于促进顽固的 α-氨基和苯乙酸烯丙酯的室温脱羧烯丙基化。这个操作简单的过程产生 CO2 作为唯一的副产品,并提供直接获取烯丙基化烷烃的途径。光化学氧化后,羧酸盐发生自由基脱羧作用,以位点特异性地生成自由基中间体,然后进行烯丙基化。提出了一种自由基双催化机制。游离苯乙酸也使用类似的反应条件进行烯丙基化。
Intramolecular Carbolithiation Reactions for the Synthesis of 2,4-Disubstituted Tetrahydro-quinolines: Evaluation of TMEDA and (−)-Sparteine as Ligands in the Stereoselectivity † Dedicated to Prof. Josep Font on the occasion of his 70th birthday.
作者:Unai Martínez-Estíbalez、Nuria Sotomayor、Esther Lete
DOI:10.1021/ol900066c
日期:2009.3.19
N-alkenylsubstituted 2-iodoanilines via intramolecular carbolithiation reactions has been investigated. The stereochemical outcome of the carbolithiation reactions depends on the nature of organolithium employed to perform the lithium-halogen exchange, the solvent, or the use of additives, for example, TMEDA or chiral bidentated ligands such as (−)-sparteine. Thus, the 2,4-disubstituted tetrahydroquinolines