Photoredox-Mediated Mono- and Difluorination of Remote Unactivated Methylene C(sp<sup>3</sup>)–H Bonds of <i>N</i>-Alkyl Sulfonamides
作者:Zhiqiang Deng、Zhenxiang Zhao、Gang He、Gong Chen
DOI:10.1021/acs.orglett.1c01020
日期:2021.5.7
A photoredox-mediated δ-C(sp3)–H fluorination of sulfonyl-protected primary alkylamines with Selectfluor is developed. The reaction can proceed in excellent monofluorination selectivity for amine substrates without α substituent. For α-substituted substrates, a slightly modified reaction conditions with two rounds of operation gives the δ,δ-difluorination products in good yield. Mechanistic studies
Copper-Catalyzed, N-Directed Csp<sup>3</sup>–H Trifluoromethylthiolation (−SCF<sub>3</sub>) and Trifluoromethylselenation (−SeCF<sub>3</sub>)
作者:Atanu Modak、Emily N. Pinter、Silas P. Cook
DOI:10.1021/jacs.9b10316
日期:2019.11.20
A direct and versatile copper-catalyzed trifluoromethylthiolation and trifluoromethylselenation of primary, secondary, and tertiary aliphatic C-H bonds was developed. The reaction provides direct access to molecules containing these emerging moieties in the presence of a wide range of common functional groups and in complex molecular environments.
[EN] LINCOSAMIDE ANTIBIOTICS AND USES THEREOF<br/>[FR] NOUVEAUX ANTIBIOTIQUES DE TYPE LINCOSAMIDES ET UTILISATIONS CORRESPONDANTES
申请人:HARVARD COLLEGE
公开号:WO2019032941A1
公开(公告)日:2019-02-14
Provided are lincosamide compounds for the treatment of infectious diseases. The lincosamides described herein are modified at the amino acid (southern) region. The lincosamides may have further modification at the C-1 and C-7 positions of the aminooctose (northern) region, thus distinguishing them from lincomycin and clindamycin. Also provided are methods for preparing the lincosamide compounds, pharmaceutical compositions comprising the lincosamide compounds, and methods of treating infectious diseases using the disclosed lincosamide compounds.
Intermolecular Anti-Markovnikov Hydroamination of Unactivated Alkenes with Sulfonamides Enabled by Proton-Coupled Electron Transfer
作者:Qilei Zhu、David E. Graff、Robert R. Knowles
DOI:10.1021/jacs.7b11144
日期:2018.1.17
Here we report a catalytic method for the intermolecularanti-Markovnikovhydroamination of unactivated alkenes using primary and secondary sulfonamides. These reactions occur at room temperature under visible light irradiation and are jointly catalyzed by an iridium(III) photocatalyst, a dialkyl phosphate base, and a thiol hydrogen atom donor. Reaction outcomes are consistent with the intermediacy
在这里,我们报告了一种使用初级和次级磺酰胺对未活化烯烃进行分子间抗马尔科夫尼科夫加氢胺化的催化方法。这些反应在室温下在可见光照射下发生,并由铱 (III) 光催化剂、磷酸二烷基酯碱和硫醇氢原子供体共同催化。反应结果与通过磺酰胺 NH 键的质子耦合电子转移激活产生的 N 中心磺酰胺自由基的中间体一致。概述了反应的合成范围(> 60 个例子)和机械特征的研究。