stereoselective synthesis of functionalized β‐amino α‐substituted tryptamines has been achieved by a sequential asymmetric organocatalytic three‐component electrophilic amination and photocatalyzed Friedel‐Crafts reaction of indoles with moderate to high diastereoselectivities (up to >99 : 1 dr) and excellent enantioselectivities (up to >99 % ee). We also demonstrated that the β‐amino α‐substituted tryptamines
Preparation of Chiral Photosensitive Organocatalysts and Their Application for the Enantioselective Synthesis of 1,2-Diamines
作者:Jiyuan Lyu、Aurélie Claraz、Maxime R. Vitale、Clémence Allain、Géraldine Masson
DOI:10.1021/acs.joc.0c01931
日期:2020.10.16
Chiral phosphoricacid based organocatalysis and visible-light photocatalysis have both emerged as promising technologies for the sustainable production of fine chemicals. In this context, we have envisioned the design and the synthesis of a new class of chimeric catalytic entities that would feature both catalytic capabilities. Given their multitask nature, such catalysts would be particularly attractive
Formal Asymmetric Organocatalytic [3+2] Cyclization between Enecarbamates and 3-Indolylmethanols: Rapid Access to 3-Aminocyclopenta[<i>b</i>]indoles
作者:Clément Lebée、Antti O. Kataja、Florent Blanchard、Géraldine Masson
DOI:10.1002/chem.201500749
日期:2015.6.1
A highly enantio‐ and diastereoselective synthesis of 3‐aminocyclopenta[b]indoles has been developed through formal [3+2] cycloaddition reaction of enecarbamates and 3‐indolylmethanols. This transformation is catalyzed by a chiral phosphoric acid that achieves simultaneous activation of both partners of the cycloaddition. Mechanistic data are also presented that suggest that the reaction occurs through
通过氨基甲酸酯和3-吲哚基甲醇的正式[3 + 2]环加成反应,已开发出高度对映体和非对映体选择性的3-氨基环戊[ b ]吲哚。该转化由手性磷酸催化,该手性磷酸实现了环加成的两个配偶体的同时活化。还提供了机理数据,表明该反应通过逐步途径发生。
Catalytic, highly enantioselective, direct amination of enecarbamates
Amination of enecarbamates with dibenzylazodicarboxylate and oxygenated nucleophiles in the presence of a catalytic amount of chiral phosphoric acid afforded optically active stable precursors of alpha-hydrazinoimines, which were reduced or oxidized, respectively, to vicinal diamines or alpha-amino acid precursors with excellent yield and enantioselectivity.
Iron Chloride‐Catalyzed Three‐Component Domino Sequences: Syntheses of Functionalized α‐Oxy‐<i>N</i>‐acylhemiaminals and α‐Oxyimides
作者:Fleur Drouet、Jieping Zhu、Géraldine Masson
DOI:10.1002/adsc.201300847
日期:2013.12.16
AbstractThe iron(III) chloride‐multicatalyzed dioxygenation of enamides with TEMPO in the presence of alcohols has been developed. This multicomponent domino process affords efficient new strategies for the synthesis of α‐oxy‐N‐acylhemiaminals or α‐oxyimides in good to excellent yields under mild conditions.magnified image