Photoredox/Cobalt Dual‐Catalyzed Decarboxylative Elimination of Carboxylic Acids: Development and Mechanistic Insight
作者:Kaitie C. Cartwright、Ebbin Joseph、Chelsea G. Comadoll、Jon A. Tunge
DOI:10.1002/chem.202001952
日期:2020.9.25
Recently, dual‐catalytic strategies towards the decarboxylative elimination of carboxylicacids have gained attention. Our lab previously reported a photoredox/cobaloxime dual catalytic method that allows the synthesis of enamides and enecarbamates directly from N‐acyl amino acids and avoids the use of any stoichiometric reagents. Further development, detailed herein, has improved upon this transformation's
The N,N′-dioxide−Cu(OTf)2complexes were applied in the asymmetric amination reaction of N-acetyl enamides with dialkyl azodicarboxylate, giving the corresponding products in good yields with high enantioselectivities (up to 91% ee). Precursors of vicinal diamine were readily obtained with excellent diastereoselectivities (>95:5) by NaBH4 reduction.
Combined Theoretical and Experimental Studies Unravel Multiple Pathways to Convergent Asymmetric Hydrogenation of Enamides
作者:Jianping Yang、Luca Massaro、Suppachai Krajangsri、Thishana Singh、Hao Su、Emanuele Silvi、Sudipta Ponra、Lars Eriksson、Mårten S. G. Ahlquist、Pher G. Andersson
DOI:10.1021/jacs.1c09573
日期:2021.12.29
We present a highly efficient convergent asymmetric hydrogenation of E/Z mixtures of enamides catalyzed by N,P–iridium complexes supported by mechanistic studies. It was found that reduction of the olefinic isomers (E and Z geometries) produces chiral amides with the same absolute configuration (enantioconvergent hydrogenation). This allowed the hydrogenation of a wide range of E/Z mixtures of trisubstituted
Exploiting the Nucleophilicity of NH Imines: Synthesis of Enamides from Alkyl Azides and Acid Anhydrides
作者:Junghoon Han、Mina Jeon、Han Kyu Pak、Young Ho Rhee、Jaiwook Park
DOI:10.1002/adsc.201400584
日期:2014.9.15
The nucleophilicity of N‐unsubstituted imines, which were generated from alkyl azides by a ruthenium‐catalyzedreaction, was investigated in the reaction with acid anhydrides. The initial products were N‐acylimines, which isomerized to the corresponding enamides. Heating or triethylamine facilitated the isomerization of N‐acylimines that are stable at room temperature. A wide range of acyclic and cyclic
申请人:POSTECH Research and Business Development Foundation 포항공과대학교 산학협력단(220040433361) BRN ▼506-82-07303
公开号:KR20160059189A
公开(公告)日:2016-05-26
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