Benzoisothiazolone Organo/Copper-Cocatalyzed Redox Dehydrative Construction of Amides and Peptides from Carboxylic Acids using (EtO)<sub>3</sub>P as the Reductant and O<sub>2</sub> in Air as the Terminal Oxidant
作者:Lanny S. Liebeskind、Pavankumar Gangireddy、Matthew G. Lindale
DOI:10.1021/jacs.6b03168
日期:2016.6.1
Carboxylic acids and amine/amino acid reactants can be converted to amides and peptides at neutral pH within 5-36 h at 50 °C using catalytic quantities of a redox-active benzoisothiazolone and a copper complex. These catalytic "oxidation-reduction condensation" reactions are carried out open to dry air using O2 as the terminal oxidant and a slight excess of triethyl phosphite as the reductant. Triethyl
Macrocyclization of Maleimide-Decorated Peptides via Late-Stage Rh(III)-Catalyzed Trp(C7) Alkenylation
作者:Yu Zhang、Shulei Hu、Yazhou Li、Yongkun Wang、Tao Yu、Qiangqiang Chen、Jiang Wang、Hong Liu
DOI:10.1021/acs.orglett.3c00601
日期:——
strategy for constructing maleimide-containing peptides and cyclicpeptides using Rh(III)-catalyzed tryptophan (Trp) (C7) alkenylation, which is challenging due to the inherent reactivity of the indole benzenoid ring. This method is scalable and exhibits broad substrate scope. The utility of this protocol could further be demonstrated by the synthesis of peptide conjugates with natural products and amino
Scalable Total Syntheses of <i>N</i>-Linked Tryptamine Dimers by Direct Indole−Aniline Coupling: Psychotrimine and Kapakahines B and F
作者:Timothy Newhouse、Chad A. Lewis、Kyle J. Eastman、Phil S. Baran
DOI:10.1021/ja1009458
日期:2010.5.26
This report details the invention of a method to enable syntheses of psychotrimine (1) and the kapakahines F and B (2, 3) on a gram scale and in a minimum number of steps. Mechanistic inquiries are presented for the key enabling quaternization of indole at the C3 position by electrophilic attack of an activated aniline species. Excellent chemo-, regio-, and diastereoselectivities are observed for reactions with o-iodoaniline, an indole cation equivalent. Additionally, the scope of this reaction is broad with respect to the tryptamine and aniline components. The anti-cancer profiles of 1-3 have also been evaluated.
Newhouse, Timothy; Lewis, Chad A.; Baran, Phil S., Journal of the American Chemical Society, 2009, vol. 131, p. 6360 - 6361
作者:Newhouse, Timothy、Lewis, Chad A.、Baran, Phil S.