Synthesis and cytotoxic activities of estrone and estradiol cis-dichloroplatinum(II) complexes
摘要:
Sixteen platinum(II) complexes of estrone and estradiol were synthesized in this work to evaluate their cytotoxic activity against several cancer cell lines including estrogen dependent and independent ones. The synthesis of all the complexes was done in three steps. The reaction of steroids with dibromoalkanes was followed by a reaction of the bromoalkyl steroids with 2-(aminomethyl) pyridine or 2-(2-aminoethyl) pyridine. The last step was a reaction of steroidal diamino ligands with potassium tetrachloroplatinate to obtain the desired platinum(II) complexes. Cytotoxicity assays showed that most of the complexes prepared are active against the cancer cell lines used-CEM, U-2 OS, MCF7, MCF7 AL, MDA-MB-468, BT-474, BT-549, and BJ fibroblasts. The six-membered platinum complexes are more active than five-membered ones. (C) 2012 Elsevier Ltd. All rights reserved.
Copper‐Catalyzed Substrate‐Controlled Carbonylative Synthesis of α‐Keto Amides and Amides from Alkyl Halides
作者:Fengqian Zhao、Han‐Jun Ai、Xiao‐Feng Wu
DOI:10.1002/anie.202200062
日期:2022.4.19
A copper-catalyzed highly selective double carbonylation of alkyl bromides and amines has been developed. Desired α-keto amides were obtained as the only products. Subsequently, under different conditions, the double and mono-carbonylations of alkyl iodides with amines were also achieved.
Iron‐Catalyzed Alkoxycarbonylation of Alkyl Bromides via a Two‐Electron Transfer Process
作者:Han‐Jun Ai、Benedict N. Leidecker、Phong Dam、Christoph Kubis、Jabor Rabeah、Xiao‐Feng Wu
DOI:10.1002/anie.202211939
日期:2022.10.24
distinct alkoxycarbonylation pattern via an in situ generated Fe2− catalyst is reported. This low-valent iron catalyst activates alkyl halides via a two-electrontransfer (TET) process, unlike previous reports where alkyl halides underwent a single electron transfer (SET). This reaction provides easy and efficient access to esters, and its mechanism will provide new ideas for the activation of alkyl halides
报道了通过原位生成的 Fe 2-催化剂产生的独特的烷氧基羰基化模式。这种低价铁催化剂通过双电子转移 (TET) 过程激活卤代烷,这与之前报道的卤代烷经历单电子转移 (SET) 不同。该反应为酯类的制备提供了简单高效的途径,其机理将为卤代烃在羰基化领域的活化提供新思路。