Cu(II)-Catalyzed 6π-Photocyclization of Non-6π Substrates
摘要:
This research successfully achieved a Cu(II)-catalyzed 6 pi-photocyclization of non-6 pi substrates. The photo-enolization converts ortho-alkylphenyl alkynl ketones into a triene-type intermediate which undergoes the subsequent 6 pi-photo- facilitates both photoenolization and 6 pi-photocyclization. This research highlighted the tandem reaction strategy and the importance of metal catalysis in photochemistry.
A concise synthesis of 1‐naphthols via cyclization of o‐iodoacetophenones and methyl ketones has been realized under very mild conditions. The cyclization process is initiated by a rare copper‐catalyzed arylation of simple methyl ketones with ortho‐iodoacetophenones.
Catalytic Asymmetric Aziridination of Benzhydryl Imines and Diazoacetate Esters with BOROX Catalysts from 3,3′-Disubstituted VANOL Ligands
作者:William D. Wulff、Yong Guan、Zhenjie Lu、Xiaopeng Yin、Aliakbar Mohammadlou、Richard J. Staples
DOI:10.1055/s-0039-1690860
日期:2020.7
into boroxinate catalysts that were used to screen the catalytic asymmetric aziridination of benzhydryl imines with ethyldiazoacetate. Each catalyst was screened in the reaction of imines generated from benzaldehyde and cyclohexanecarboxaldehyde and some with 4-nitro- and 4-methoxybenzaldehyde. In addition, the first report of the effect of the ester substituent of the diazoacetate ester on the asymmetric
A Ru(II)-catalyzed coupling of various α-carbonyl phosphoniums with sulfoxoniumylides has been realized for the facile synthesis of 1-naphthols in good to excellent yields. This oxidant-free transformation proceeds through Ru-catalyzed C–H activation of phosphoniums, Ru-carbene insertion, and intramolecular Wittig reaction processes.
A Succinct Synthesis of the Vaulted Biaryl Ligand Vanol via a Dienone-Phenol Rearrangement
作者:Zhensheng Ding、Song Xue、William D. Wulff
DOI:10.1002/asia.201000804
日期:2011.8.1
different approaches to the synthesis of 3‐phenyl‐1‐naphthol, a key intermediate in the synthesis of vanol. The first approach has its key step as the Michael addition of a benzyl Grignard to methylcinnamate. In the second approach the key step is the first step, a Reformatsky reaction of ethyl bromoacetate and deoxybenzoin. The final and most‐efficient approach involves a dienone‐phenol rearrangement
Cu‐catalyzed synthesis of 1‐naphthols with terminal alkynes and 2‐bromoaryl ketones
作者:Peng Ma、Yuhang Wang、Jianhui Wang
DOI:10.1002/aoc.6792
日期:2022.9
A Cu-catalyzed straightforward synthesis of 1-naphthols via an 6-endo-dig cyclization of terminalalkynes with 2-bromoaryl ketones in water is reported. The Cu(I) catalytic system tolerates various electron-withdrawing and electron-donating functional groups on both substrates and exhibits unique 6-endo-dig selectivity to give 1-naphthols in moderate to good yields.