of catalytic amounts of optically active aminoalcohols, the irradiation of α-disubstituted indanones, tetralones and propiophenones bearing at least one hydrogen in the γ-position led to Norrish type II cleavage compounds which were obtained with enantiomeric excesses reaching 89%. The influence of the reaction conditions (temperature, wavelength of the UV light and nature of the alcohol) has been analyzed
Pd
<sup>II</sup>
‐Catalyzed C(alkenyl)−H Activation Facilitated by a Transient Directing Group**
作者:Mingyu Liu、Juntao Sun、Tuğçe G. Erbay、Hui‐Qi Ni、Raúl Martín‐Montero、Peng Liu、Keary M. Engle
DOI:10.1002/anie.202203624
日期:2022.6.20
An oxidative cross-coupling between two alkenes under the dual action of a PdII catalyst and a transient directinggroup (TDG) is demonstrated. The reaction involves TDG-mediated C(alkenyl)−H activation to generate an endo-palladacycle intermediate, whose formation is promoted by a tailored carboxylic acid additive.
Munro, David P.; Sharp, John T., Journal of the Chemical Society. Perkin transactions I, 1984, # 4, p. 849 - 858
作者:Munro, David P.、Sharp, John T.
DOI:——
日期:——
A Transient‐Directing‐Group Strategy Enables Enantioselective Reductive Heck Hydroarylation of Alkenes
作者:Lucas J. Oxtoby、Zi‐Qi Li、Van T. Tran、Tuğçe G. Erbay、Ruohan Deng、Peng Liu、Keary M. Engle
DOI:10.1002/anie.202001069
日期:2020.6.2
practicality of reactions that rely on their use. Inspired by developments in asymmetric organocatalysis, where reactions rely on reversible covalent interactions between an organic substrate and a chiral mediator, we have developed a transient-directing-group approach to reductive Heck hydroarylation of alkenyl benzaldehyde substrates that proceeds under mild conditions. Highly stereoselective migratory insertion
The intramolecular hydroacylation of 1,2-disubstituted alkenes was considered to be a challenging task due to the side reactions resulted from the lack of additional substituent at 1-position and the low activity caused by the steric hindrance of substituent at 2-position, and an asymmetric version has not been considered possible due to problems associated with the racemization of the products. We