Enantioselective Synthesis of Tryptophan Derivatives by a Tandem Friedel–Crafts Conjugate Addition/Asymmetric Protonation Reaction
作者:Madeleine E. Kieffer、Lindsay M. Repka、Sarah E. Reisman
DOI:10.1021/ja209390d
日期:2012.3.21
tandem Friedel-Crafts conjugate addition/asymmetric protonation reaction between 2-substituted indoles and methyl 2-acetamidoacrylate is reported. The reaction is catalyzed by (R)-3,3'-dibromo-BINOL in the presence of stoichiometric SnCl(4), and is the first example of a tandem conjugate addition/asymmetric protonation reaction using a BINOL·SnCl(4) complex as the catalyst. A range of indoles furnished
A mild and selective Pd-mediated methodology for the synthesis of highly fluorescent 2-arylated tryptophans and tryptophan-containing peptides: a catalytic role for Pd<sup>0</sup> nanoparticles?
作者:Thomas J. Williams、Alan J. Reay、Adrian C. Whitwood、Ian J. S. Fairlamb
DOI:10.1039/c3cc48481e
日期:——
A Pd-mediated direct C-H bond functionalisation of tryptophan has been developed, both as a single amino acid residue and within peptides. Important mechanistic insight into this process has been gained by characterising a Pd catalytically competent nanoparticle phase which evolves during the early stages of reaction.
Unified mild reaction conditions for C2-selective Pd-catalysed tryptophan arylation, including tryptophan-containing peptides
作者:Alan J. Reay、Thomas J. Williams、Ian J. S. Fairlamb
DOI:10.1039/c5ob01174d
日期:——
Mild Pd-mediated C–H functionalisation protocols, facilitating tryptophanC2-arylation, have been developed. Tryptophan-containing peptides, susceptible to oxidation, have been arylated.
通过Pd介导的温和C-H官能化协议,促进了色氨酸的C2芳基化。易氧化的含色氨酸肽已被芳基化。
10.1021/acs.orglett.4c01019
作者:da S. Santos, Bruno M.、Finelli, Fernanda G.、Spring, David R.
DOI:10.1021/acs.orglett.4c01019
日期:——
methodology for photoredox arylation of an indole scaffold using aryldiazonium salts under mild and metal-free conditions. Our approach enables the regioselective and chemoselective introduction of several aryl groups to the C(2) position of indoles and tryptophan, even in competition with other amino acids. This approach extends to the late-stage functionalization of peptides and lysozyme, heralding
Mild and Regioselective Pd(OAc)<sub>2</sub>-Catalyzed C–H Arylation of Tryptophans by [ArN<sub>2</sub>]X, Promoted by Tosic Acid
作者:Alan J. Reay、L. Anders Hammarback、Joshua T. W. Bray、Thomas Sheridan、David Turnbull、Adrian C. Whitwood、Ian J. S. Fairlamb
DOI:10.1021/acscatal.6b03121
日期:2017.8.4
regioselective Pd-mediated C-H bond arylation methodology for tryptophans, utilizing stable aryldiazonium salts, affords C2-arylated tryptophan derivatives, in several cases quantitatively. The reactions proceed in air, without base, and at room temperature in EtOAc. The synthetic methodology has been evaluated and compared against other tryptophan derivative arylation methods using the CHEM21 green chemistry