Free and Polymer-Bound Tricyclic Azaphosphatranes HP(RNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N<sup>+</sup>: Procatalysts in Dehydrohalogenations and Debrominations with NaH
作者:Xiaodong Liu、John G. Verkade
DOI:10.1021/jo990217f
日期:1999.6.1
efficient procatalyst for these reactions and also for the debromination of vicinal dibromides using NaH as a relatively inexpensive stoichiometric hydride source in CH(3)CN at room temperature. In dehydrohalogenations requiring more than ca. 10 h, the CH(2)CN(-) ion also acts as a base. By itself, NaH does not function well or at all under the same conditions. A catalytic cycle is proposed in which hydride
A general N-alkylation platform via copper metallaphotoredox and silyl radical activation of alkyl halides
作者:Nathan W. Dow、Albert Cabré、David W.C. MacMillan
DOI:10.1016/j.chempr.2021.05.005
日期:2021.7
The catalytic union of amides, sulfonamides, anilines, imines, or N-heterocycles with a broad spectrum of electronically and sterically diverse alkyl bromides has been achieved via a visible-light-induced metallaphotoredox platform. The use of a halogen abstraction-radical capture (HARC) mechanism allows for room temperature coupling of C(sp3)-bromides using simple Cu(II) salts, effectively bypassing
通过可见光诱导的金属光氧化还原平台实现了酰胺、磺胺、苯胺、亚胺或N-杂环与广谱电子和空间多样化烷基溴的催化结合。卤素提取-自由基捕获 (HARC) 机制的使用允许使用简单的 Cu(II) 盐在室温下耦合 C( sp 3 )-溴化物,有效绕过通常与热诱导 S N 2 或 S相关的过高障碍N 1 N-烷基化。这种区域和化学选择性方案与 >10 类药物相关的N兼容- 亲核试剂,包括已建立的药剂,以及结构多样的伯、仲和叔烷基溴。此外,通过将N-亲核试剂与环丙基溴和未活化的烷基氯(与亲核取代途径不相容的底物)结合,突出了 HARC 方法与传统惰性偶联伙伴结合的能力。初步的机械实验验证了该平台的双重催化、开壳性质,这使得在传统的基于卤化物的N-烷基化系统中无法实现的反应性成为可能。
Alkylboronic Esters from Copper-Catalyzed Borylation of Primary and Secondary Alkyl Halides and Pseudohalides
作者:Chu-Ting Yang、Zhen-Qi Zhang、Hazmi Tajuddin、Chen-Cheng Wu、Jun Liang、Jing-Hui Liu、Yao Fu、Maria Czyzewska、Patrick G. Steel、Todd B. Marder、Lei Liu
DOI:10.1002/anie.201106299
日期:2012.1.9
unprecedented copper‐catalyzed cross‐coupling reaction of the title compounds with diboron reagents is described (see scheme; Ts=4‐toluenesulfonyl). This reaction can be used to prepare both primary and secondaryalkylboronic esters having diverse structures and functional groups. The resulting products would be difficult to access by other means.
Synthesis, Properties, and Crystal Structure of Silyl Nitronates (Silyl Esters ofaci-Nitroalkanes): Towards theSN2 Reaction Path with Retention of Configuration at Silicon
作者:Ernest W. Colvin、Albert K. Beck、Bahram Bastani、Dieter Seebach、Yasushi Kai、Jack D. Dunitz
DOI:10.1002/hlca.19800630320
日期:1980.4.23
the preparation of silyl nitronates is described (see 1–10). NMR. spectral investigations indicate a rapid 1,3-silylmigration process, with an activation energy of about 10 kcal mol−1. X-ray crystallographic studies on the silyl nitronates 3 and 8 show structures that lean towards an SN2 retention pathway at silicon.
描述了一种高效,灵活的制备甲磺酸硅烷基酯的方法(参见1-10)。核磁共振。光谱研究表明,快速的1,3-甲硅烷基迁移过程具有约10 kcal mol -1的活化能。对甲硅烷基磺酸盐3和8的X射线晶体学研究表明,其结构倾向于向S N 2保留在硅的路径。
PEPTIDOMIMETIC GLUTATHIONE ANALOGS
申请人:UNIVERSITEIT LEIDEN
公开号:US20040063640A1
公开(公告)日:2004-04-01
The invention relates to peptidomimetic compounds with formula
1
wherein Z=CH
2
and Y=CH
2
, or Z=O and Y=C═C), which are novel analogs of glutathion and are inhibitors of glutathione S-tansferase, in particular of GST P1-1. Such inhibition has beneficial effects in therapy against cancer.
In particular compounds in which R
3
is H, R
4
is benzyl and R
5
is phenyl are stable towards &ggr;GT activity and are selective for GST P1-1.