Asymmetric hydrogenation of isoquinolines with chiral cationic ruthenium diamine catalysts
作者:Zi-Qi Yi、Fei Chen、Yan-Mei He、Qing-Hua Fan
DOI:10.1016/j.tet.2023.133736
日期:2023.12
general asymmetrichydrogenation of isoquinolines catalyzed by chiral cationic ruthenium catalysts has been investigated. A wide range of isoquinoline derivatives, including 1-substituted, 3-substituted, 1,3-disubstituted and 3,4-disubstituted isoquinolines, were efficiently hydrogenated to give chiral tetrahydroisoquinolines with up to 92 % ee and >20:1 dr. It was found that the ruthenium catalyst bearing
研究了手性阳离子钌催化剂催化的异喹啉的一般不对称氢化。多种异喹啉衍生物,包括 1-取代、3-取代、1,3-二取代和 3,4-二取代异喹啉,可有效氢化得到手性四氢异喹啉,其 ee 高达 92%,dr 大于 20:1。研究发现,带有非配位BArF阴离子的钌催化剂具有高对映选择性。初步机理研究表明,异喹啉通过逐步途径还原,包括1,2-氢化物加成、异构化和2,3-氢化物加成。
Stereoselective synthesis of 3-substituted tetrahydroisoquinolines from phthalan and chiral N-sulfinylimines
The reaction of the dianionic intermediate [resulting from the reductive opening of phthalan (1) with lithium] with chiral N-tert-butylsulfinyl aldimines 3 in the presence of ZnMe2 gives, after hydrolysis, N-tert-butylsulfinyl amino alcohols 4 with high diastereoselectivity. Successive treatment of compounds 4 with hydrogen chloride in methanol, thionyl chloride in chloroform and sodium hydroxide yields 3-substituted tetrahydroisoquinolines 6. (C) 2009 Elsevier Ltd. All rights reserved.
Reductive Ring-Opening of Phthalan and Isochroman: Application to the Stereoselective Synthesis of Tetrahydroisoquinolines and Tetrahydrobenzazepines
作者:Daniel García、Francisco Foubelo、Miguel Yus
DOI:10.1002/ejoc.201000111
日期:2010.5
The reaction of the dianionic intermediates 2a,b resulting from the lithiation of phthalan (1a) and isochroman (1b) with chiral N-tert-butylsulfinyl aldimines 9 in the presence of ZnMe2 gave, after hydrolysis, N-tert-butylsulfinyl amino alcohols 10 and 13, respectively, with high diastereoselectivity. Successive treatment of compounds 10 and 13 with hydrogen chloride in methanol, thionyl chloride in