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- W2280217777 abstract "Abstract The racemic carbonate complex [Co(en) 2 O 2 CO] + Cl − (en=1,2‐ethylenediamine) and ( S )‐[H 3 NCH((CH 2 ) n NHMe 2 )CH 2 NH 3 ] 3+ 3 Cl − ( n =1–4) react (water, charcoal, 100 °C) to give [Co(en) 2 (( S )‐H 2 NCH((CH 2 ) n NHMe 2 )CH 2 NH 2 )] 4+ 4 Cl − ( 3 a – d H 4+ 4 Cl − ) as a mixture of Λ/Δ diastereomers that separate on chiral‐phase Sephadex columns. These are treated with NaOH/Na + BAr f − (BAr f =B(3,5‐C 6 H 3 (CF 3 ) 2 ) 4 ) to give lipophilic Λ‐ and Δ‐ 3 a–d 3+ 3 BAr f − , which are screened as catalysts (10 mol %) for additions of dialkyl malonates to nitroalkenes. Optimal results are obtained with Λ‐ 3 c 3+ 3 BAr f − (CH 2 Cl 2 , −35 °C; 98–82 % yields and 99–93 % ee for six β‐arylnitroethenes). The monofunctional catalysts Λ‐ and Δ‐[Co(en) 3 ] 3+ 3 BAr f − give enantioselectivities of <10 % ee with equal loadings of Et 3 N. The crystal structure of Δ‐ 3 a H 4+ 4 Cl − provides a starting point for speculation regarding transition‐state assemblies." @default.
- W2280217777 created "2016-06-24" @default.
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- W2280217777 date "2016-02-25" @default.
- W2280217777 modified "2023-10-14" @default.
- W2280217777 title "Werner Complexes with ω‐Dimethylaminoalkyl Substituted Ethylenediamine Ligands: Bifunctional Hydrogen‐Bond‐Donor Catalysts for Highly Enantioselective Michael Additions" @default.
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- W2280217777 doi "https://doi.org/10.1002/anie.201511314" @default.
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