Enantioselective total synthesis of (S)-(+)-lennoxamine through asymmetric hydrogenation mediated by l-proline-tetrazole ruthenium catalyst
作者:Yaneris Mirabal-Gallardo、Johanna Piérola、Nagula Shankaraiah、Leonardo S. Santos
DOI:10.1016/j.tetlet.2012.05.033
日期:2012.7
A novel asymmetric synthetic strategy to prepare isoindolobenzazepine based lennoxamine alkaloid has been achieved in high ee% starting from 2-(benzo[d][1,3]dioxol-5-yl)ethanamine and 1-(chloromethyl)-2,3-dimethoxybenzene in 5 steps and with a 34% overall yield. The potentiality of this route involved the Bischler–Napieralsky cyclization that leads to tetracyclic indolinium skeleton, generation of
从2-(苯并[ d ] [1,3]二恶酚-5-基)乙胺和1-(氯甲基)-2,3-苯胺开始,以高ee%获得了制备基于异吲哚并苯并ze庚因的伦诺沙明生物碱的新的不对称合成策略。二甲氧基苯分5步,总收率34%。这条路线的潜力涉及Bischler-Napieralsky环化,该环化导致四环吲哚骨架,通过使用l-脯氨酸-四唑作为手性配体并以Ru / Ir / Rh进行不对称氢转移反应生成手性中心,以及阳极氧化为关键综合步骤。