Rhodium-Catalyzed Addition of Arylboronic Acids to Isatins: An Entry to Diversity in 3-Aryl-3-Hydroxyoxindoles
作者:Patrick Y. Toullec、Richard B. C. Jagt、Johannes G. de Vries、Ben L. Feringa、Adriaan J. Minnaard
DOI:10.1021/ol0608101
日期:2006.6.1
[reaction: see text] A generalmethod for the catalytic 1,2-addition of aryl and alkenyl boronic acids to isatins is described using a rhodium(I)/triphenylphosphite catalyst. The application of this transformation allows the synthesis of a variety of 3-aryl-3-hydroxyoxindole building blocks in high yields. An enantioselective version of this reaction using a rhodium(I)/phosphoramidite system is also
Construction of Alkylidene Fluorene Scaffolds Using Pd-Catalyzed Direct Arene/Alkene Coupling Strategy
作者:Hidenori Matsuyama、Xuan Zhang、Masahiro Terada、Tienan Jin
DOI:10.1021/acs.orglett.2c04307
日期:2023.2.10
alkylidene fluorenes and their heteroarene derivatives has been developed successfully by means of a Pd(II)-catalyzed direct C–H/C–H coupling of o-alkenyl biaryls. Use of the Pd(OAc)2 catalyst under aerobic oxidation conditions gives rise to the corresponding alkylidene fluorenes having various functional groups and diversely fused polycyclic systems. The resulting products can serve as versatile synthetic
Asymmetric conjugate addition of cis-2-arylethenylboronic acids catalyzed by chiral diene/rhodium complexes: 1,4-rhodium shift from alkenylrhodium to arylrhodium intermediates
作者:Keigo Sasaki、Tamio Hayashi
DOI:10.1016/j.tetasy.2012.03.004
日期:2012.3
The reaction of (E)-1,2-diphenylethenylboronic acid 1 with 2-cyclohexenone in the presence of a chiral diene/rhodium catalyst (5 mol %) gave 3-[2-((E)-2-phenylethenyl)phenyl]cyclohexanone in 99% yield with 98.7% ee; the catalytic cycle involves a 1,4-rhodium shift from a 2-phenylethenylrhodium to an ortho-alkenylphenylrhodium intermediate. In the reaction of 1 with (E)-1-phenyl-2-buten-1-one, either the tandem 1,4-shift/arylation product or the direct alkenylation product is formed selectively by an appropriate choice of chiral diene ligand. (C) 2012 Elsevier Ltd. All rights reserved.