A Mild and General Larock Indolization Protocol for the Preparation of Unnatural Tryptophans
作者:Kangway V. Chuang、Madeleine E. Kieffer、Sarah E. Reisman
DOI:10.1021/acs.orglett.6b02477
日期:2016.9.16
A mild and general protocol for the Pd(0)-catalyzed heteroannulation of o-bromoanilines and alkynes is described. Application of a Pd(0)/P(tBu)3 catalyst system enables the efficient coupling of o-bromoanilines at 60 °C, mitigating deleterious side reactions and enabling access to a broad range of useful unnatural tryptophans. The utility of this new protocol is demonstrated in the highly convergent
作者:You-Chen Lin、Fabian Schneider、Kelly J. Eberle、Debora Chiodi、Hugh Nakamura、Solomon H. Reisberg、Jason Chen、Masato Saito、Phil S. Baran
DOI:10.1021/jacs.2c05892
日期:2022.8.17
A concise, modular synthesis of the novel antibiotic darobactin A is disclosed. The synthesis successfully forges the hallmark strained macrocyclic ring systems in a sequential fashion. Key transformations include two atroposelective Larock-based macrocyclizations, one of which proceeds with exquisite regioselectivity despite bearing an unprotected alkyne. The synthesis is designed with medicinal chemistry
Copper-Mediated Single-Electron Approach to Indoline Amination: Scope, Mechanism, and Total Synthesis of Asperazine A
作者:James B. Shaum、Andrei Nikolaev、Helena C. Steffens、Luis Gonzalez、Shamon Walker、Andrey V. Samoshin、Gabrielle Hammersley、Ellia H. La、Javier Read de Alaniz
DOI:10.1021/acs.joc.2c00923
日期:2022.8.5
C3–N linkage comprise the core of many biologically active natural products, but many methods toward their synthesis are limited by the sterics or electronics of the product. We report a single electron-based approach for the synthesis of this scaffold and demonstrate high-yielding aminations, regardless of electronic or steric demands. The transformation uses copper wire and isopropanol to promote
作者:Fabian Schneider、Yinliang Guo、You-Chen Lin、Kelly J. Eberle、Debora Chiodi、Johnathan A. Greene、Chenxin Lu、Phil S. Baran
DOI:10.1021/jacs.3c11560
日期:2024.3.13
The first total synthesis of the potent antimicrobial agent dynobactin A is disclosed. This synthesis enlists a singular aziridine ring opening strategy to access the two disparate β-aryl-branched amino acids present within this complex decapeptide. Featuring a number of unique maneuvers to navigate inherently sensitive and epimerizable functional groups, this convergent approach proceeds in only 16
首次公开了强效抗菌剂 Dynobactin A 的全合成。该合成采用单一的氮丙啶开环策略来接触该复杂十肽中存在的两个不同的 β-芳基支链氨基酸。这种聚合方法具有许多独特的操作来导航固有敏感和差向异构的官能团,从商业材料中仅需要 16 个步骤 (LLS),并且应该有助于合成用于药物化学研究的众多类似物。
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.