A catalytic version of hypervalent aryl-λ3-iodane-induced Hofmann rearrangement of primary carboxamides: iodobenzene as an organocatalyst and m-chloroperbenzoic acid as a terminal oxidant
六氢化物 OsH 6 (P i Pr 3 ) 2有效地催化脂肪族腈水合为酰胺。催化条件下的主要金属物种是三氢化锇(IV)酰胺化物衍生物OsH 3 {κ 2 - N , O -[HNC(O)R]}(P i Pr 3 ) 2,它们已被分离和充分表征对于 R = i Pr 和t卜。水合速率与催化剂前体、腈和水的浓度成正比。当这些实验结果和密度泛函理论计算相结合时,催化机制已经建立。配合物OsH 3 {κ 2 - N , O -[HNC(O)R]}(P i Pr 3 ) 2解离螯合物的羰基,得到与腈配位的κ 1 - N -酰胺衍生物。随后外部水分子攻击腈的 C(sp) 原子和酰胺化物的 N 原子,得到酰胺并再生 κ 1 - N-酰胺催化剂。该攻击是协同的,并通过循环六元过渡态发生,其中涉及 C腈···O-H···N酰胺相互作用。在攻击之前,κ 1 - N -酰胺配体的游离羰基将水分子固定在腈的 C(sp)
Directingstrategy has been extensively exploited to maintain activity and selectivity for the rapid access to functionalized molecules and pharmaceutical targets. However, ‘one‐to‐one’ activation model was usually achieved through traditional directingstrategy. Herein, we achieved ‘one‐to‐two’ activation model by slight modification of simple and practical ketoxime and amide functionality. With judicious
Lead Discovery, Chemistry Optimization, and Biological Evaluation Studies of Novel Biamide Derivatives as CB<sub>2</sub> Receptor Inverse Agonists and Osteoclast Inhibitors
作者:Peng Yang、Kyaw-Zeyar Myint、Qin Tong、Rentian Feng、Haiping Cao、Abdulrahman A. Almehizia、Mohammed Hamed Alqarni、Lirong Wang、Patrick Bartlow、Yingdai Gao、Jürg Gertsch、Jumpei Teramachi、Noriyoshi Kurihara、Garson David Roodman、Tao Cheng、Xiang-Qun Xie
DOI:10.1021/jm301212u
日期:2012.11.26
N,N′-((4-(Dimethylamino)phenyl)methylene)bis(2-phenylacetamide) was discovered by using 3D pharmacophore database searches and was biologically confirmed as a new class of CB2 inverse agonists. Subsequently, 52 derivatives were designed and synthesized through lead chemistry optimization by modifying the rings A–C and the core structure in further SAR studies. Five compounds were developed and also
N , N '-((4-(二甲氨基)苯基)亚甲基)双(2-苯基乙酰胺)是通过使用3D药效团数据库搜索发现的,并被生物学证实为一类新的CB 2反向激动剂。随后,在进一步的 SAR 研究中,通过修饰环 A-C 和核心结构,通过先导化学优化设计和合成了 52 种衍生物。开发了五种化合物并证实它们是 CB 2反向激动剂,具有最高的 CB 2结合亲和力(CB 2 K i为 22–85 nM,EC 50为 4–28 nM)和最佳选择性(CB 1 /CB 2235 到 909 倍)。此外,破骨细胞生成生物测定表明 PAM 化合物对破骨细胞形成有很大的抑制作用。特别是,化合物26即使在0.1 μM的低浓度下也表现出72%的抑制活性。细胞毒性试验表明,PAM 化合物对破骨细胞生成的抑制作用不是由其细胞毒性引起的。因此,这些 PAM 衍生物可作为开发新型抗骨质疏松药物的潜在先导物。
The invention provides antimicrobial agents and methods of using the agents for sterilization, sanitation, antisepsis, disinfection, and treatment of infections in mammals.
这项发明提供了抗菌剂和使用这些剂进行哺乳动物的消毒、卫生、防腐、消毒和治疗感染的方法。
The palladium(<scp>ii</scp>)-catalyzed regioselective <i>ortho</i>-C–H bromination/iodination of arylacetamides with <i>in situ</i> generated imidic acid as the directing group: mechanistic exploration
作者:Yogesh Jaiswal、Yogesh Kumar、Amit Kumar
DOI:10.1039/c9ob01082c
日期:——
study, we report the palladium(ii)-catalyzed regioselective ortho-C-H bromination/iodination of challenging arylacetamide derivatives using N-halosuccinimides as halogenating agents. Diverse arylacetamides underwent the regioselective ortho-bromination and iodination of aromatic C-H bonds in the presence of a reactive benzylic C(sp3)-H bond without installing any bulky auxiliaries via unfavorable six-membered
Highly Chemoselective Reduction of Amides (Primary, Secondary, Tertiary) to Alcohols using SmI<sub>2</sub>/Amine/H<sub>2</sub>O under Mild Conditions
作者:Michal Szostak、Malcolm Spain、Andrew J. Eberhart、David J. Procter
DOI:10.1021/ja412578t
日期:2014.2.12
Highly chemoselective direct reduction of primary, secondary, and tertiary amides to alcohols using SmI2/amine/H2O is reported. The reaction proceeds with C–N bond cleavage in the carbinolamine intermediate, shows excellent functional group tolerance, and delivers the alcohol products in very high yields. The expected C–O cleavage products are not formed under the reaction conditions. The observed