Oxone® (2KHSO5·KHSO4·K2SO4) was used to promote the nitration of alkenes and alkynes with sodium nitrite (NaNO2) and potassium iodide (KI). This stable, easy-to-handle, and environmentally benign oxidant was used under mild conditions (room temperature) and provided short reaction times. Styrene derivatives that did not contain electron-donating groups afforded the corresponding nitro alkenes in moderate
of α,β-unsaturated methyl ketone/nitro compounds from benzylic amines through an oxidation–aldol/Henry reaction is reported. The reaction proceeded well by using MCPBA as oxidant and CuCl2·2H2O as catalyst. A variety of functionalized α,β-unsaturated methyl ketone/nitro compounds were assembled in moderate yields by application of this catalytic one-pot reaction.
Catalytic and Mechanistic Developments of the Nickel(II) Pincer Complex‐Catalyzed Hydroarsination Reaction
作者:Wee Shan Tay、Yunpeng Lu、Xiang‐Yuan Yang、Yongxin Li、Sumod A. Pullarkat、Pak‐Hing Leung
DOI:10.1002/chem.201902138
日期:——
significantly slowed the development of the catalytic asymmetric hydroarsinationreaction despite it being a highly attractive C-As bond formation methodology. In addition, there is a poor understanding of the main reaction steps in such reactions which limit further development in the field. Herein, key intermediates of the hydroarsinationreactioncatalyzed by a PCP NiII -Cl pincercomplex are presented upon
Discovery and Rational Design of Natural-Product-Derived 2-Phenyl-3,4-dihydro-2<i>H</i>-benzo[<i>f</i>]chromen-3-amine Analogs as Novel and Potent Dipeptidyl Peptidase 4 (DPP-4) Inhibitors for the Treatment of Type 2 Diabetes
Starting from the lead isodaphnetin, a natural product inhibitor of DPP-4 discovered through a target fishing docking based approach, a series of novel 2-phenyl-3,4-dihydro-2H-benzo[f]chromen-3-amine derivatives as potent DPP-4 inhibitors are rationally designed utilizing highly efficient 3D molecular similarity based scaffold hopping as well as electrostatic complementary methods. Those ingenious
从通过靶标对接的方法发现的DPP-4天然产物抑制剂异佛定素开始,一系列新的2-苯基-3,4-二氢-2 H-苯并[ f ]铬-3-胺衍生物因为有效的DPP-4抑制剂是通过基于高效3D分子相似性的支架跳跃以及静电互补方法进行合理设计的。这些巧妙的药物设计策略为我们带来了大约7400倍的效能提升。化合物22A和24A是最有效的那些(IC 50 ≈2.0纳米)具有良好的药代动力学曲线。化合物22a表现出稳定的药理作用。3 mg / kg口服剂量可在24小时内抑制DPP-4活性> 80%,这与长效对照奥格列汀的表现相当。此外,22a在改善葡萄糖耐量方面的功效也与奥格列汀相当。在这项研究中,不仅确定了有前途的DPP-4抑制剂(长效抗糖尿病药,而且临床上需要),而且成功实现了目标鱼的对接和药物化学策略。