<i>C</i><sub>1</sub>-Symmetric Rare-Earth-Metal Aminodiolate Complexes for Intra- and Intermolecular Asymmetric Hydroamination of Alkenes
作者:Alexander L. Reznichenko、Kai C. Hultzsch
DOI:10.1021/om3010614
日期:2013.3.11
are achieved with catalysts having a methyldiphenylsilyl substituent on the naphtholate moiety. Lanthanum aminodiolate catalysts generated in situ from [LaCH(C6H5)NMe2}3] did not exhibit improved catalytic activity in the intermolecular hydroamination in comparison to the corresponding yttrium and lutetium catalysts. The overall catalytic activities of the aminodiolate complexes are somewhat diminished
Asymmetric Intermolecular Hydroamination of Unactivated Alkenes with Simple Amines
作者:Alexander L. Reznichenko、Hiep N. Nguyen、Kai C. Hultzsch
DOI:10.1002/anie.201004570
日期:2010.11.15
A hard nut to crack: The asymmetric intermolecular Markovnikov addition of simple amines to unactivatedalkenes can be achieved utilizing binaphtholate rare‐earth‐metal catalysts with up to 61 % ee and 73 % de in the case where R2 contains a stereogenic center.
1,1‘-Binaphthyl-2,2‘-diyl Phosphoroselenoyl Chloride as a Chiral Molecular Tool for the Preparation of Enantiomerically Pure Alcohols and Amines
作者:Toshiaki Murai、Daichi Matsuoka、Ken Morishita
DOI:10.1021/ja060308b
日期:2006.4.1
Enantiomerically pure phosphoroselenoyl chloride bearing a binaphthyl group was synthesized. This phosphoroselenoyl chloride was used to discriminate and resolve simple secondary alcohols. Stereospecific conversions of diastereomerically pure phosphoroselenoic acid esters, obtained by reaction of the chloride with simple secondary alcohols, to enantiomerically purealcohols and amines were also achieved
Asymmetric Intra- and Intermolecular Hydroamination Catalyzed by 3,3′-Bis(trisarylsilyl)- and 3,3′-Bis(arylalkylsilyl)-Substituted Binaphtholate Rare-Earth-Metal Complexes
作者:Hiep N. Nguyen、Hyeunjoo Lee、Stephan Audörsch、Alexander L. Reznichenko、Agnieszka J. Nawara-Hultzsch、Bernd Schmidt、Kai C. Hultzsch
DOI:10.1021/acs.organomet.8b00510
日期:2018.12.10
activity in the hydroamination/cyclization of aminoalkenes, with activities exceeding 1000 h–1 for (R)-2f-Ln, (R)-2g-Ln, and (R)-2h-Ln in the cyclization of 2,2-diphenylpent-4-enylamine (3a) at 25 °C, while the rigid dibenzosilole-substituted complexes (R)-2a-Ln and the triisopropylsilyl-substituted complexes (R)-2d-Ln exhibited the lowest activity in the range of 150–270 h–1. Catalysts (R)-2b-Lu, (R)-2c-Lu
We report the use of benzylamine as the amine component in Hantzsch ester mediated and chiral Bronsted acid catalyzed enantioselective reductiveaminations of ketones. The method is noteworthy because the benzyl group is easily removable, and amine product purification is achieved through Hantzsch ester oxidation product removal via basic hydrolysis.