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。
Synthesis of modified Weinreb amides: N-tert-butoxy-N-methylamides as effective acylating agents
An efficient preparation of N-methyl-O-tert-butylhydroxylamine hydrochloride has been settled, which allowed the synthesis of modified Weinreb amides. Nucleophilic addition of organolithium and Grignard reagents on these N-tert-butoxy-N-methylamides afforded efficiently the corresponding ketones and reduction with DIBAL furnished the corresponding aldehydes in good yields up to 97%.
Visible-Light-Mediated Synthesis of Amidyl Radicals: Transition-Metal-Free Hydroamination and <i>N</i>-Arylation Reactions
作者:Jacob Davies、Thomas D. Svejstrup、Daniel Fernandez Reina、Nadeem S. Sheikh、Daniele Leonori
DOI:10.1021/jacs.6b04920
日期:2016.7.6
The development of photoredox reactions of aryloxy-amides for the generation of amidylradicals and their use in hydroamination-cyclization and N-arylation reactions is reported. Owing to the ease of single-electron-transfer reduction of the aryloxy-amides, the organic dye eosin Y was used as the photoredox catalyst, which results in fully transition-metal-free processes. These transformations exhibit
报道了芳氧基-酰胺光氧化还原反应产生酰胺基自由基的发展及其在加氢胺化-环化和 N-芳基化反应中的应用。由于芳氧基酰胺易于单电子转移还原,有机染料伊红 Y 被用作光氧化还原催化剂,这导致完全无过渡金属的过程。这些转变表现出广泛的范围,可以容忍几个重要的功能,并已用于复杂和高价值含氮分子的后期修饰。
TETRACYCLINE COMPOUNDS HAVING TARGET THERAPEUTIC ACTIVITIES
申请人:Paratek Pharmaceuticals, Inc.
公开号:US20180016225A1
公开(公告)日:2018-01-18
Methods and compounds for treating diseases with tetracycline compounds having a target therapeutic activity are described.