A highly efficient asymmetric hydrogenation of racemic α-arylaldehydes via dynamickineticresolution has been developed by using [RuCl2(SDPs)(diamine)] complexes as catalysts, providing chiral primaryalcohols in excellent enantioselectivities.
Determination of the Absolute Configuration of β-Chiral Primary Alcohols Using the Competing Enantioselective Conversion Method
作者:Alexander S. Burns、Alexander J. Wagner、Jennifer L. Fulton、Kyle Young、Armen Zakarian、Scott. D. Rychnovsky
DOI:10.1021/acs.orglett.7b01189
日期:2017.6.2
A method for determining the absoluteconfiguration of β-chiral primary alcohols has been developed. Enantioenriched alcohols were acylated in the presence of either enantiomer of the enantioselective acylation catalyst HBTM, and the faster reaction was determined by measuring product conversion using 1H NMR spectroscopic analysis. An empirical mnemonic was developed that correlates the absolute configuration
已经开发出确定β-手性伯醇的绝对构型的方法。在对映选择性酰化催化剂HBTM的任何一种对映异构体的存在下,将富含对映体的醇酰化,并通过使用1 H NMR光谱分析测量产物转化率来确定更快的反应。开发了经验助记符,其将醇的绝对构型与更快反应的催化剂相关联。该方法成功的底物包括在立体异构中心带有“指导基团”的伯醇。指导基团包括芳烃,杂芳烃,烯酮和卤化物。
Catalytic asymmetric hydrogenation of aldehydes
作者:Xiaoguang Li、Benjamin List
DOI:10.1039/b703977h
日期:——
alcohols via dynamic kinetic resolution in excellent enantioselectivities and yields upon hydrogenation using a Noyori ruthenium catalyst; for example, the biologically active (S)-enantiomer of the non-steroidal anti-inflammatory drug ibuprofen could be synthesized via catalytic enantioselective hydrogenation of aldehyde followed by oxidation with potassium permanganate in 76% isolated yield and 96
(34%), respectively. The mixed ferrocene 16 (63%) was prepared from 13a/b and pentamethylcyclopentadiene. Treatment of 6/7 with PhLi at −78° gave a 5:3 mixture of the 1-C-phenylated alcohols 17a/b and 18a/b (71%) which were silylated to 19a/b and 20a/b, respectively. Lithiation of 19/20 and reaction with FeCl2 afforded the symmetric ferrocenes 21 and 22 and the mixed ferrocene 23 (54:15:31, 79%) which were