N-Fmoc-aminooxy-2-chlorotrityl polystyrene resin: A facile solid-phase methodology for the synthesis of hydroxamic acids
作者:Sarah L Mellor、Carolann McGuire、Weng C Chan
DOI:10.1016/s0040-4039(97)00594-7
日期:1997.5
Using the new compound N-Fmoc-hydroxylamine 1 we have generated a facile route to a high loading, acid labile solid-phase resin bearing a hydroxylamine linker. The novel N-Fmoc-aminooxy-2-chlorotrityl polystyrene 2 showed generic utility for the construction of hydroxamic acids, including peptidyl hydroxamic acids. (C) 1997 Elsevier Science Ltd.
A Versatile Polymer-Supported 4-(4-Methylphenyl(chloro)methyl)phenoxy Linker for Solid-Phase Synthesis of Pseudopeptides
作者:Gail E. Atkinson、Peter M. Fischer、Weng C. Chan
DOI:10.1021/jo000315x
日期:2000.8.1
Mellor, Sarah L.; Chan, Weng C., Chemical Communications, 1997, # 20, p. 2005 - 2006
作者:Mellor, Sarah L.、Chan, Weng C.
DOI:——
日期:——
General methodology for solid-phase synthesis of N -alkyl hydroxamic acids
作者:Viktor Krchňák、Greg A Slough
DOI:10.1016/j.tetlet.2004.04.105
日期:2004.6
Polymer-supported N-benzyloxy-2-nitrobenzenesulfonamides 1 were N-alkylated using three different routes: via Fukuyama reaction with alcohols, by N-alkylation with alkylbromides, and by Michael addition reaction with alpha, beta-unsaturated carbonyl compounds. The N-alkylated products prepared on the linker 1b were obtained in excellent purity and yield. The 2-nitrobenzenesulfonyl (Nos) group was cleaved under mild conditions to yield polymer-supported N-alkylated benzyloxyamines. Acylation by carboxylic acids and cleavage with TFA yielded N-alkyl hydroxamic acids. (C) 2004 Elsevier Ltd. All rights reserved.
Enantioselective Direct α-Amination of Aldehydes via a Photoredox Mechanism: A Strategy for Asymmetric Amine Fragment Coupling
作者:Giuseppe Cecere、Christian M. König、Jennifer L. Alleva、David W. C. MacMillan
DOI:10.1021/ja406181e
日期:2013.8.7
The direct, asymmetric α-amination of aldehydes has been accomplished via a combination of photoredox and organocatalysis. Photon-generated N-centered radicals undergo enantioselective α-addition to catalytically formed chiral enamines to directly produce stable α-amino aldehyde adducts bearing synthetically useful amine substitution patterns. Incorporation of a photolabile group on the amine precursor
醛的直接、不对称 α-胺化是通过光氧化还原和有机催化的组合完成的。光子生成的 N 中心自由基与催化形成的手性烯胺进行对映选择性 α-加成,直接产生具有合成有用胺取代模式的稳定 α-氨基醛加合物。在胺前体上引入光不稳定基团避免了在该转化中使用光氧化还原催化剂的需要。重要的是,这种光诱导转化允许直接和对映选择性地获得不需要反应后操作的 α-氨基醛产品。