Cobalt-Catalyzed Asymmetric Hydrogenation of 1,1-Diarylethenes
作者:Jianhui Chen、Chenhui Chen、Chonglei Ji、Zhan Lu
DOI:10.1021/acs.orglett.6b00453
日期:2016.4.1
Highlyenantioselective cobalt-catalyzed hydrogenation of 1,1-diarylethenes was developed by using bench-stable chiral oxazoline iminopyridine–cobalt complexes as precatalysts. A unique o-chloride effect was observed to achieve high enantioselectivity. Easy removal as well as further transformations of the chloro group make this protocol a potentially useful alternative to synthesize various chiral
Highly Enantioselective Cobalt-Catalyzed Hydroboration of Diaryl Ketones
作者:Wenbo Liu、Jun Guo、Shipei Xing、Zhan Lu
DOI:10.1021/acs.orglett.0c00293
日期:2020.4.3
A highlyenantioselective cobalt-catalyzed hydroboration of diaryl ketones with pinacolborane was developed using chiral imidazole iminopyridine as a ligand to access chiral benzhydrols in good to excellent yields and ee. This protocol could be carried out in a gram scale under mild reaction conditions with good functional group tolerance. Chiral biologically active 3-substituted phthalide and (S)-neobenodine
CuH-Catalyzed Asymmetric 1,6-Conjugate Reduction of <i>p</i>-Quinone Methides: Enantioselective Synthesis of Triarylmethanes and 1,1,2-Triarylethanes
作者:Ting Pan、Pan Shi、Bo Chen、Da-Gang Zhou、Ya-Li Zeng、Wen-Dao Chu、Long He、Quan-Zhong Liu、Chun-An Fan
DOI:10.1021/acs.orglett.9b02308
日期:2019.8.16
The first copperhydride (CuH)-catalyzed asymmetric 1,6-conjugate reduction of p-quinone methides is reported. This protocol provides a new method to access a variety of triarylmethanes and 1,1,2-triarylethanes in good yields with excellent enantioselectivities and broad functional group tolerance.
Directed Magnesiation of Polyhaloaromatics using the Tetramethylpiperidylmagnesium Reagents TMP<sub>2</sub>Mg⋅2 LiCl and TMPMgCl⋅LiCl
作者:Andreas Unsinn、Christoph J. Rohbogner、Paul Knochel
DOI:10.1002/adsc.201300185
日期:2013.5.17
A convenient and efficient functionalization of polyhaloaromatics via regioselective magnesiation has been developed. Starting from simple, inexpensive but structurally challenging arenes, metallation by magnesium amide bases was achieved under mild conditions. The desired Grignardreagents were stable towards aryne formation, were obtained in good yields within short reaction times and could be reacted
Recyclable and reusable Pd(OAc)2/P(1-Nap)3/[bmim][PF6]/H2O system for the addition of arylboronic acids to aldehydes
作者:Hong Zhao、Mingzhu Cheng、Tinli Zhang、Mingzhong Cai
DOI:10.1016/j.jorganchem.2014.11.020
日期:2015.2
A stable and efficient Pd(OAc)2/P(1-Nap)3[tri(1-naphthyl)phosphine] catalytic system for the addition of arylboronicacids to aldehydes has been developed. In the presence of Pd(OAc)2 and P(1-Nap)3, the addition reaction of arylboronicacids with aldehydes was carried out smoothly at 65 °C to give a variety of carbinol derivatives in good to excellent yields using a mixture of [bmim][PF6] and water