Atom-economic threefold cross-couplings of triarylbismuth reagents with 2-halobenzaldehydes and pot-economic in situ Wittig functionalizations with phosphonium salts
cobalt-catalyzed hetero-biaryl couplingreaction between aryl chlorides and arylmagnesium halides with unprecedented selectivity has been developed. The protocol utilizes 1 mol% of cheap Co(acac)3 as pre-catalyst and effects clean reactions of deactivated chlorostyrenes with only 1.1 equiv. of the Grignard reagent under mild conditions (30 °C, 5–30 min). Highly chemoselective reactions were realized even in
Chlorostyrenes in Iron-Catalyzed Biaryl Coupling Reactions
作者:Samet Gülak、Axel Jacobi von Wangelin
DOI:10.1002/anie.201106110
日期:2012.2.6
An effective protocol for iron‐catalyzed biaryl syntheses by couplingchlorostyrenes with aryl Grignard reagents requires only mild reaction conditions and tolerates various functional groups. The underlying activation of deactivated aryl chlorides proceeds through a rate‐determining coordination of the catalyst to the vinyl substituent and subsequent haptotropic migration along the conjugated π system
General Reaction Conditions for the Palladium-Catalyzed Vinylation of Aryl Chlorides with Potassium Alkenyltrifluoroborates
作者:Emilio Alacid、Carmen Nájera
DOI:10.1021/jo901681s
日期:2009.11.6
Activated and deactivated aryl and heteroaryl chlorides are efficiently cross-coupled with potassium vinyl- and alkenyltrifluoroborates using 4-hydroxyacetophenone oxime derived palladacycle as precatalyst in 1 to 3 mol % Pd loading, Binap as ligand, and Cs2CO3 as base in DMF at 120 °C. The reactions can also be performed using Pd(OAc)2 as Pd(0) source, although with lower efficiency. Bidentate ligands
活化和失活的芳基和杂芳基氯与乙烯基和链烯基三氟硼酸钾有效地交联,使用4-羟基苯乙酮肟肟衍生的palladacycle作为预催化剂,钯负载量为1-3 mol%,Binap作为配体,Cs 2 CO 3作为DMF中的碱120℃。尽管效率较低,但也可以使用Pd(OAc)2作为Pd(0)源进行反应。可以使用双齿配体,例如Binap和dppp,前者是最佳选择。仅在失活的芳基氯化物的情况下,才应将反应温度提高至160°C,以获得良好的收率。以高收率和高区域选择性和非对映选择性获得了相应的交叉偶联化合物,例如苯乙烯,对苯二甲酸酯和链烯基芳烃。
Redox-Neutral Generation of Iminyl Radicals by <i>N</i>-Heterocyclic Carbene Catalysis: Rapid Access to Phenanthridines from Vinyl Azides
作者:Lixia Liu、Qijing Zhang、Chengming Wang
DOI:10.1021/acs.orglett.2c02118
日期:2022.8.19
carbene-catalyzed oxidant-, metal- and light-free iminyl radical generation pathway stemming from the reaction of vinyl azide and α-bromo ester is uncovered. This newly developed methodology is successfully applied to the redox-neutral construction of a number of diversified phenanthridine derivatives with nice functional group compatibility. Insights from the mechanism study reveal that this NHC-catalyzed transformation
揭示了源自乙烯基叠氮化物和 α-溴酯反应的N-杂环卡宾催化的氧化剂、金属和无光亚胺基自由基生成途径。这种新开发的方法成功地应用于具有良好官能团相容性的多种菲啶衍生物的氧化还原中性构建。机理研究表明,这种 NHC 催化的转化可能通过烷基自由基加成引发的 HAS 过程进行,亚胺自由基作为活性中间体。
STEROIDAL COMPOUNDS WITH POTENT ANDROGEN RECEPTOR DOWN-REGULATION AND ANTI PROSTATE CANCER ACTIVITY
申请人:University of Maryland, Baltimore
公开号:EP3514147A1
公开(公告)日:2019-07-24
Nonsteroid and steroid compounds that cause down-regulation of the androgen receptor (AR), both full length and splice variant, induce apoptosis and inhibit proliferation of inhibiting proliferation and migration of androgen sensitive cancer cells. The steroid compounds and nonsteroid compounds may be agents for the prevention and/or treatment of cancer, including prostate cancer, castration resistant prostate cancer, bladder cancer, pancreatic cancer, hepatocellular carcinoma, benign prostatic hyperplasia (BPH), Kennedy's disease, androgenetic alopecia, breast cancer, androgen-insensitive syndrome, and spinal and bulbar muscular atrophy.