Gold Catalysis and Chiral Sulfoxides: Enantioselective Synthesis of Dihydroisoindol-4-ols
作者:A. Stephen K. Hashmi、Sascha Schäfer、Jan W. Bats、Wolfgang Frey、Frank Rominger
DOI:10.1002/ejoc.200800656
日期:2008.10
-magnesium compounds to these imines allowed a 1,2-induction. After propargylation, the sulfinamides gave low conversion with gold catalysts. Oxidation to chiral sulfonamides, propargylation and gold-catalysed cycloisomerization to the phenol delivered non-racemic dihydroisoindol-4-ols in good yields. In situ NMR studies prove the intermediacy of the arene oxide even with the AuCl3 catalyst.(© Wiley-VCH
糠醛和对映体纯亚磺酰胺已缩合为 N-亚磺酰亚胺。将有机锂或镁化合物添加到这些亚胺中可以进行 1,2-诱导。炔丙基化后,亚磺酰胺在金催化剂的作用下转化率低。氧化成手性磺酰胺、炔丙基化和金催化的环异构化成苯酚以良好的产率提供非外消旋二氢异吲哚-4-醇。原位 NMR 研究证明,即使使用 AuCl3 催化剂,芳烃氧化物也是中间体。(© Wiley-VCH Verlag GmbH & Co. KGaA,69451 Weinheim,德国,2008 年)