α-Functionalization of 2-Vinylpyridines via a Chiral Phosphine Catalyzed Enantioselective Cross Rauhut–Currier Reaction
作者:Cong Qin、Yonghai Liu、Yang Yu、Yiwei Fu、Hao Li、Wei Wang
DOI:10.1021/acs.orglett.8b00008
日期:2018.3.2
Herein, 2-vinylpyridines as a newtype of electron-poor system for the asymmetric cross Rauhut–Currier reaction are reported. 2-Vinylpyridines are chemo- and enantioselectively activated by a newly designed chiral phosphine catalyst. The newreaction provides a powerful synthetic tool for accessing structurally diverse, highly valued chiral pyridine building blocks in good yields and with high enantioselectivities
sulfinamide bisphosphine catalysts (Wei‐Phos) were developed. These could be easily prepared from commercially available starting materials. Wei‐Phos has shown good performance in the very challenging intermolecular cross‐Rauhut–Currier reactions of vinyl ketones and 3‐acyl acrylates or 2‐ene‐1,4‐diones, leading to the R‐C products in high yields with up to 99 % ee under 2.5–5 mol% catalyst loading. The highly
Functionalized Tetrahydropyridines by Enantioselective Phosphine-Catalyzed Aza-[4 + 2] Cycloaddition of <i>N</i>-Sulfonyl-1-aza-1,3-dienes with Vinyl Ketones
The development of electron-demand disfavored [4 + 2] cycloaddition of two electron-deficient reacting partners poses a considerable challenge. An enantioselective aza-[4 + 2] cycloaddition of electron-deficient N-sulfonyl-1-aza-1,3-dienes is possible with vinyl ketones via phosphine catalysis, which provides facileaccess to a wide range of enantioenriched trifluoromethylated tetrahydropyridines in
Design, Synthesis, and Application of a Chiral Sulfinamide Phosphine Catalyst for the Enantioselective Intramolecular Rauhut-Currier Reaction
作者:Xiao Su、Wei Zhou、Yangyan Li、Junliang Zhang
DOI:10.1002/anie.201500907
日期:2015.6.1
A novel class of chiral sulfinamide phosphine catalysts (Xiao‐Phos) are reported, which can be easily prepared from inexpensive commercially available starting materials. The Xiao‐Phos catalysts showed good performance in enantioselectiveintramolecular Rauhut–Currier reactions, generating α‐methylene‐γ‐butyrolactones in high yields with up to 99 % ee under mild conditions. Moreover, kinetic resolution