The first B(C6F5)3‐catalyzed deoxygenative reduction of amides into the corresponding amines with readily accessible and stable ammonia borane (AB) as a reducing agent under mild reaction conditions is reported. This metal‐free protocol provides facile access to a wide range of structurally diverse amine products in good to excellent yields, and various functional groups including those that are reduction‐sensitive
据报道,在温和的反应条件下,用易于获得且稳定的氨硼烷(AB)作为还原剂,将酰胺进行的首次B(C 6 F 5)3催化脱氧还原为相应的胺。该无金属方案可轻松获得各种结构多样的胺产品,且收率高至优异,并且对各种官能团(包括对还原敏感的官能团)均具有良好的耐受性。该新方法也适用于手性酰胺底物,而不会破坏对映体的纯度。BF 3 OEt 2助催化剂在该反应中的作用是通过酰胺-硼加合物的原位形成来活化酰胺羰基。
Novel hybrid conjugates with dual estrogen receptor α degradation and histone deacetylase inhibitory activities for breast cancer therapy
substituents on both the sulfonamide nitrogen and phenyl group of OBHSA unit had significant effect on biological activities. Among them, conjugate 16i with N-methyl and naphthyl groups exhibited potent antiproliferative activity against MCF-7 cells, and excellent ERα degradation activity and HDACs inhibitory ability. A further molecular docking study indicated the interaction patterns of these conjugates
Bicyclic core estrogens as full antagonists: synthesis, biological evaluation and structure–activity relationships of estrogen receptor ligands based on bridged oxabicyclic core arylsulfonamides
作者:Manghong Zhu、Chen Zhang、Jerome C. Nwachukwu、Sathish Srinivasan、Valerie Cavett、Yangfan Zheng、Kathryn E. Carlson、Chune Dong、John A. Katzenellenbogen、Kendall W. Nettles、Hai-Bing Zhou
DOI:10.1039/c2ob26531a
日期:——
Compounds that block estrogen action through the estrogenreceptor (ER) or downregulate ER levels are useful for the treatment of breast cancer and endocrine disorders. In our search for structurally novel estrogens having three-dimensional corescaffolds, we found some compounds with a 7-oxabicyclo[2.2.1]heptene core that bound well to the ERs. The best of these compounds, a phenyl sulfonate ester
通过雌激素受体 (ER) 阻断雌激素作用或下调 ER 水平的化合物可用于治疗乳腺癌和内分泌疾病。在我们寻找具有三维核心支架的结构新颖雌激素时,我们发现了一些具有 7-氧杂双环 [2.2.1] 庚烯核心的化合物,这些化合物与 ER 结合良好。这些化合物中最好的一种,苯磺酸酯(称为氧杂双环庚烯磺酸盐的 OBHS),是 ERα 和 ERβ 的部分拮抗剂。尽管 OBHS 与其他雌激素拮抗剂在结构上没有相似之处,但它似乎通过稳定 ER 的新构象来实现其部分拮抗剂特征,该构象涉及螺旋 11 的显着扭曲。为了增强这些氧杂双环[2.2.1]庚烷核心配体的拮抗剂特性,2 NR–),等电子和潜在的等结构分子置换。通过 3,4-二芳基呋喃的 Diels-Alder 反应,使用各种N-芳基乙烯基磺酰胺亲二烯体。虽然极性更大的仲磺酰胺是弱配体,但某些叔磺酰胺具有非常好的 ER 结合亲和力。在 HepG2 细胞报告基
Cu-Catalyzed/mediated synthesis of <i>N</i>-fluoroalkylanilines from arylboronic acids: fluorine effect on the reactivity of fluoroalkylamines
作者:Hui Wang、Yuan-Hong Tu、De-Yong Liu、Xiang-Guo Hu
DOI:10.1039/c8ob01581c
日期:——
An oxidative coupling reaction of fluoroalkylamines with arylboronicacids has been achieved for the first time. Fluorine has profound influence on the reactivity and fluoroalkylated amines have the following reactivity trend: difluoroethylamine > trifluoroethylamine > pentafluoropropylamine ≈ heptafluorobutylamine.
Silver(I)‐Catalyzed
<i>N</i>
‐Trifluoroethylation of Anilines and
<i>O</i>
‐Trifluoroethylation of Amides with 2,2,2‐Trifluorodiazoethane
作者:Haiqing Luo、Guojiao Wu、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201507219
日期:2015.11.23
A straightforward N‐trifluoroethylation of anilines has been developed based on silver‐catalyzedNH insertions with 2,2,2‐trifluorodiazoethane (CF3CHN2). Mechanistically, the reaction is proposed to involve migratory insertion of a silver carbene as the key step. In contrast, when amides are employed as the substrates under similar reaction conditions, O‐trifluoroethylation occurs to afford trifluoroethyl