A highly efficient asymmetric hydrogenation of cyclicimines containing a pyridyl moiety was established by using iridium catalysts with chiral spiro phosphine-oxazoline ligands. This process will facilitate the development of new nicotine-related pharmaceuticals. The introduction of a substituent at the ortho position of the pyridyl ring to reduce its coordinating ability ensures the success of the
Menschikoff et al., Chemische Berichte, 1934, vol. 67, p. 1398,1400
作者:Menschikoff et al.
DOI:——
日期:——
Kabatschnik; Kaznel'son, Zhurnal Obshchei Khimii, 1935, vol. 5, p. 1289,1295,1296
作者:Kabatschnik、Kaznel'son
DOI:——
日期:——
Kabatschnik; Kaznel'son, Chemische Berichte, 1935, vol. 68, p. 399,402
作者:Kabatschnik、Kaznel'son
DOI:——
日期:——
Enantioselective Syntheses of Both Enantiomers of Noranabasamine
作者:Lei Miao、Stassi C. DiMaggio、Hong Shu、Mark L. Trudell
DOI:10.1021/ol9002288
日期:2009.4.2
>30% overall yield with 80% ee and 86% ee, respectively. An enantioselective iridium-catalyzed N-heterocyclization reaction with either (R)- or (S)-1-phenylethylamine and 1-(5-methoxypyridin-3-yl)-1,5-pentanediol was employed to generate the 2-(pyridin-3-yl)-piperidine ring system in 69−72% yield.
两栖生物碱noranabasamine的R和S对映异构体均以>30% 的总收率制备,ee 分别为80% 和86%。使用对映选择性铱催化的N-杂环化反应与 ( R )- 或 ( S )-1-苯乙胺和 1-(5-甲氧基吡啶-3-基)-1,5-戊二醇生成 2-(吡啶-3-基)-哌啶环系统,产率为 69-72%。