An enantioselective reduction of azaarene-based ketones through photoredoxasymmetriccatalysis is reported. With a transition metal-free dual catalytic system including a chiral phosphoric acid and a photosensitizer DPZ mediated by visible light, the transformations involved a tandem process involving double single-electron-transfer reductions and enantioselective protonation, providing valuable chiral
Protic-Solvent-Mediated Cycloisomerization of Quinoline and Isoquinoline Propargylic Alcohols: Syntheses of (±)-3-Demethoxyerythratidinone and (±)-Cocculidine
作者:Stephen T. Heller、Toshihiro Kiho、Alison R. H. Narayan、Richmond Sarpong
DOI:10.1002/anie.201304687
日期:2013.10.11
route to these unique azacycles (see example). The utility of the benzindolizinone products was demonstrated by the application of this method to the total synthesis of the Erythrinaalkaloids 3‐demethoxyerythratidinone and cocculidine.
将“苯”放入吲哚嗪酮中:苯并[ g ] 吲哚嗪酮和苯并[ e ] 吲哚嗪酮的环异构化方法为这些独特的氮杂环提供了第一条通用路线(参见示例)。通过将这种方法应用于刺桐生物碱 3-脱甲氧基赤霉啶酮和球虫碱的全合成,证明了苯并吲哚嗪酮产品的实用性。