Use of (NHC)Pd(η<sup>3</sup>-allyl)Cl (NHC =<i>N</i>-Heterocyclic Carbene) in a Palladium-mediated Approach to<i>Cryptocarya</i>Alkaloids
作者:Steven P. Nolan、Simon S. Cämmerer、Mihai S. Viciu、Edwin D. Stevens
DOI:10.1055/s-2003-41468
日期:——
The palladium-mediated intramolecular aryl amination of 7-benzyloxy-1-(2-bromo-4,5-dimethoxy-benzyl)-1,2,3,4-tetrahydro-6-methoxy-isoquinoline catalyzed by a recently discovered, air and moisture stable (NHC)Pd(eta(3)-allyl)Cl (NHC = N-heterocyclic carbene) complex provides 2-benzyloxy-5,6,12,12a-tetrahydro-3,9,10-trime-thoxydibenz-[b,g]-indolizine in high yield. Effects of the solvent, the catalyst
钯介导的 7-苄氧基-1-(2-溴-4,5-二甲氧基-苄基)-1,2,3,4-四氢-6-甲氧基-异喹啉的分子内芳胺化,由最近发现的空气催化和水分稳定的 (NHC)Pd(eta(3)-allyl)Cl (NHC = N-杂环卡宾) 络合物提供 2-benzyloxy-5,6,12,12a-tetrahydro-3,9,10-trime-thoxydibenz- [b,g]-indolizine 高产。检查了溶剂、催化剂负载和 NHC 辅助配体的性质对反应效率的影响。使用相同的条件 7-benzyloxy-1-(2-chloro-4,5-methylendioxybenzyl)-1,2,3,4-tetrahydro-6-methoxyisoquinoline 生成 2-benzyloxy-5,6-12,12a-tetrahydro- 3-甲氧基-9,10-亚甲基二氧基二苯-[b,g]-吲哚茚,也以高产率获得。