A General Organocatalytic System for Enantioselective Radical Conjugate Additions to Enals
作者:Emilien Le Saux、Dengke Ma、Pablo Bonilla、Catherine M. Holden、Danilo Lustosa、Paolo Melchiorre
DOI:10.1002/anie.202014876
日期:2021.3
enantioselective conjugate addition of carbon‐centered radicals to aliphatic and aromatic enals. The process uses an organic photoredox catalyst, which absorbs blue light to generate radicalsfrom stable precursors, in combination with a chiral amine catalyst, which secures a consistently high level of stereoselectivity. The generality of this catalytic platform is demonstrated by the stereoselective interception
Visible-light excitation of iminium ions enables the enantioselective catalytic β-alkylation of enals
作者:Mattia Silvi、Charlie Verrier、Yannick P. Rey、Luca Buzzetti、Paolo Melchiorre
DOI:10.1038/nchem.2748
日期:2017.9
organisms. Herein we demonstrate that the direct excitation of chiral iminium ions can unlock unconventional reaction pathways, enablingenantioselective catalytic photochemical β-alkylations of enals that cannot be realized via thermal activation. The chemistry uses readily available alkyl silanes, which are recalcitrant to classical conjugateadditions, and occurs under illumination by visible-light-emitting
Catalysis of Kumada–Tamao–Corriu coupling by a (POCOP)Rh pincer complex
作者:Samuel D. Timpa、Claudia M. Fafard、David E. Herbert、Oleg V. Ozerov
DOI:10.1039/c1dt10161g
日期:——
A pincer-based (POCOP)Rh catalyst is demonstrated to be an active and well-defined catalyst for the coupling of select aryl and alkyl Grignards with aryl iodides. The proposed intermediacy of oxidative addition of aryl halides to (POCOP)RhI is supported by the isolation of the oxidative addition product.
事实证明,基于钳子的(P O C O P)Rh催化剂是一种活性良好的催化剂,可用于将精选的芳基和烷基格氏试剂与碘代芳烃偶联。分离出的氧化加成产物支持了将芳基卤化物氧化加成(P O C O P)Rh I的中间方法。
Fluoroalkylselenolation of Alkyl Silanes/Trifluoroborates under Metal‐Free Visible‐Light Photoredox Catalysis
Aliphatic trifluromethylselenolated compounds were accessed under visible‐lightmetalfree conditions. The key to success is the use of alkylsilanes or potassium alkyltrifluoroborates in conjunction with trifluoromethylselenosulfonate and acridinium as photocatalyst.