Sunlight-driven trifluoromethylation of olefinic substrates by photoredox catalysis: A green organic process
作者:Munetaka Akita、Takashi Koike
DOI:10.1016/j.crci.2015.01.013
日期:2015.7
types of catalytic photoredox processes following the reductive quenching cycle (RQC) and the oxidative quenching cycle (OQC), the discussion is focused on organic transformations based on OQC, in particular the trifluoromethylation of olefinic substrates with electrophilic trifluoromethylating reagents furnishing solvolytic addition products and substitution products. It is concluded that catalytic
Highly Enantioselective Alkenylation of Cyclic α,β-Unsaturated Carbonyl Compounds as Catalyzed by a Rhodium-Diene Complex: Application to the Synthesis of (<i>S</i>)-Pregabalin and (−)-α-Kainic Acid
作者:Hong-Jie Yu、Cheng Shao、Zhe Cui、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1002/chem.201202660
日期:2012.10.15
Rhod to addition: An efficient asymmetric conjugate‐addition reaction of alkenyltrifluoroborates and α,β‐unsaturated carbonyl compounds, as catalyzed by a rhodium–dienecomplex, was developed. The products were obtained in high yield and high levels of enantioselectivity. The methodology was applied to a concise synthesis of (S)‐pregabalin and (−)‐α‐kainic acid (see scheme).
The enantioselective organocatalytic conjugate alkenylation of β-substituted alkenyl benzimidazoles afforded β-stereogenic 2-alkyl benzimidazole derivatives in excellent enantioselectivities. Chiral binaphthols were effective catalysts for promoting the nucleophilic addition of bench-stable alkenyl trifluoroborate salts under mild conditions, expanding their applications by utilizing C=N-containing
A Scalable Synthesis of Chiral Himbert Diene Ligands for Asymmetric Catalysis
作者:Raja K. Rit、Hongyi Li、Stephen P. Argent、Katherine M. Wheelhouse、Simon Woodward、Hon Wai Lam
DOI:10.1002/adsc.202300039
日期:——
Chiral dienes are important ligands in asymmetriccatalysis but they are less accessible than other commonly used ligands such as chiral bisphosphines. Here, we show that intramolecular [4+2] cycloaddition of a simply attained chiral allenecarboxanilide readily affords pseudoenantiomeric bicyclo[2.2.2]octa-2,5-dienes containing an alkenyl bromide, which can be readily functionalized to give diverse