Enantioselective Syntheses of Corynanthe Alkaloids by Chiral Brønsted Acid and Palladium Catalysis
作者:Martin J. Wanner、Elise Claveau、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1002/chem.201103150
日期:2011.12.2
Synergistic catalysis: Three indole alkaloids (−)‐corynantheidine, (+)‐corynantheine and (+)‐dihydro‐corynantheine were prepared following a short and common strategy based on the binol phosphoric acid catalyzed enantioselective Pictet–Spengler reaction, followed by closure of the final ring by an intramolecular Tsuji–Trost‐type Pd‐catalyzed allylic alkylation by using an α‐ketoester‐derived enolate
协同催化:基于吲哚酚磷酸催化的对映选择性Pictet-Spengler反应的短时且通用的策略,制备了三种吲哚生物碱(-)-corynantheidine,(+)-corynantheine和(+)-dihydro-corynantheine通过使用α-酮酸酯衍生的烯酸酯作为亲核试剂,通过分子内Tsuji-Trost型Pd催化的烯丙基烷基化作用形成最终环。