Nickel-Catalyzed Asymmetric Hydrocyanation of Allenes
作者:Jinguo Long、Jihui Gao、Xianjie Fang
DOI:10.1021/acs.orglett.9b03938
日期:2020.1.17
The first catalytic enantioselective hydrocyanation of allenes catalyzed by a (R,R)-Ph-BPE-Ni(0) complex catalyst has been accomplished. Numerous optically active allylic nitriles were obtained in good yield with excellent enantioselectivities (up to 98% ee).
Room Temperature Allenation of Terminal Alkynes with Aldehydes
作者:Junzhe Xiao、Yifan Cui、Can Li、Haibo Xu、Yizhan Zhai、Xue Zhang、Shengming Ma
DOI:10.1002/anie.202109879
日期:2021.12
Au(SIPr)NTf2 has been identified for the roomtemperature ATA reaction to afford diverse 1,3-disubstituted allenes with 1-methyl-1,2,3,4-tetrahydroisoquinoline as amine and aldehyde and TFE or HFIP as the mediator. A formal synthesis of (−)-centrolobine and synthetic transformations have been demonstrated.
Au(SIPr)NTf 2已被确定用于室温 ATA 反应,以提供不同的 1,3-二取代丙二烯,1-甲基-1,2,3,4-四氢异喹啉作为胺和醛,TFE 或 HFIP 作为介体。已经证明了 (-)-centrolobine 和合成转化的正式合成。
CuI-Catalyzed Cross-Coupling of <i>N</i>-Tosylhydrazones with Terminal Alkynes: Synthesis of 1,3-Disubstituted Allenes
作者:Mohammad Lokman Hossain、Fei Ye、Yan Zhang、Jianbo Wang
DOI:10.1021/jo3024686
日期:2013.2.1
A CuI-catalyzedsynthesis of 1,3-disubstituted allenesfrom1-alkynes by the reaction with various N-tosylhydrazones has been developed. This method, which uses readily available starting materials and is operationally simple, offers 1,3-disubstituted allenes in moderate to good yields. The reaction also tolerates various functional groups.
Intermolecular rhodium catalyzed hydroacylation of allenes: the regioselective synthesis of β,γ-unsaturated ketones
作者:Helen E. Randell-Sly、James D. Osborne、Robert L. Woodward、Gordon S. Currie、Michael C. Willis
DOI:10.1016/j.tet.2009.03.054
日期:2009.6
A variety of β-S-substituted aldehydes undergo efficient and regioselectiverhodiumcatalyzedhydroacylation reactions with 1,3-disubstituted and 1,1,3-trisubstituted allenes, to deliver β,γ-unsaturated ketone products. Regioselectivites are controlled primarily by steric factors. The reactions are catalyzed by the complex [Rh(dppe)]ClO4.
Catalytic Enantioselective Intermolecular Hydroacylation: Rhodium-Catalyzed Combination of β-<i>S</i>-Aldehydes and 1,3-Disubstituted Allenes
作者:James D. Osborne、Helen E. Randell-Sly、Gordon S. Currie、Andrew R. Cowley、Michael C. Willis
DOI:10.1021/ja8069133
日期:2008.12.24
A rhodium(I) catalyst incorporating the Me-DuPhos ligand promotes enantioselective intermolecular hydroacylation between P-S-aldehydes and 1,3-disubstituted allenes. The nonconjugated enone products are obtained in good yields and with high enantioselectivities.