Highly Enantioselective Desymmetrization of Centrosymmetric pseudo-para-Diformyl[2.2]paracyclophane via Asymmetric Transfer Hydrogenation
نویسندگان
چکیده
منابع مشابه
Highly enantioselective asymmetric transfer hydrogenation (ATH) of α-phthalimide ketones.
A mild catalyst system for the synthesis of chiral amino alcohols via asymmetric transfer hydrogenation (ATH) of α-phthalimide ketones has been developed by using a chiral Ru-TsDPEN complex as the catalyst in DMF/MeOH at 40 °C. The reaction exhibits high reaction activity and excellent enantioselectivity where up to 96% yield and 99% ee of the product were obtained.
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Ruthenium-complexes of novel carbohydrate based pseudo-dipeptide ligands effectively and selectively catalyze the reduction of a broad range of aryl-alkyl ketones under ATH conditions. Excellent enantioselectivities (>99% ee) are obtained using aminosugars as the sole source of chirality.
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Ex-changing places: a highly enantioselective desymmetrization of 1,2-diols has been developed in which the catalyst utilizes reversible covalent bonding to the substrate to achieve both high selectivity and rate acceleration (see scheme, PMP=pentalmethylpiperidine, TBS=tert-butyldimethylsilyl). Induced intramolecularity is responsible for the enhanced rate, thus allowing the reaction to be per...
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ژورنال
عنوان ژورنال: ACS Catalysis
سال: 2018
ISSN: 2155-5435,2155-5435
DOI: 10.1021/acscatal.8b01872