Chemoselective Conjugate Reduction of α,β-Unsaturated Ketones Catalyzed by Rhodium Amido Complexes in Aqueous Media
作者:Xuefeng Li、Liangchun Li、Yuanfu Tang、Ling Zhong、Linfeng Cun、Jin Zhu、Jian Liao、Jingen Deng
DOI:10.1021/jo100256t
日期:2010.5.7
electron-withdrawing functional groups, could be reduced on the alkenic double bonds with high selectivities employing amido-rhodium hydride complex in aqueousmedia, and up to 100% chemoselectivity has been achieved. It is notable that the chemoselectivity was improved significantly on going from organic solvent to water. Moreover, a 1,4-addition mechanism has been proposed on the basis of the corresponding
The present invention relates to novel cysteinyl leukotriene (specifically LTD4) antagonists, mainly to quinolin, quinoxaline or benz[c]thiazole derivatives represented by the general formula (I), or the pharmaceutically acceptable salt thereof, process of preparation thereof, and to the use of the compounds in the preparation of pharmaceutical compositions for the therapeutic treatment of disorders related to cysteinyl leukotriene, in mammals, more specially in humans.
Chemoselective Luche-Type Reduction of α,β-Unsaturated Ketones by Magnesium Catalysis
作者:Yoon Kyung Jang、Marc Magre、Magnus Rueping
DOI:10.1021/acs.orglett.9b03131
日期:2019.10.18
The chemoselective reduction of α,β-unsaturatedketones by use of an economic and readily available Mg catalyst has been developed. Excellent yields for a wide range of ketones have been achieved under mild reaction conditions, short times, and low catalyst loadings (0.2-0.5 mol %).
4-(β-Arylvinyl)-3-(β-arylvinylketo)-1-ethyl-4-piperidinols and Related Compounds: A Novel Class of Cytotoxic and Anticancer Agents
作者:Jonathan R. Dimmock、Sarvesh C. Vashishtha、J. Wilson Quail、Uma Pugazhenthi、Zbigniew Zimpel、Athena M. Sudom、Theresa M. Allen、Grace Y. Kao、Jan Balzarini、Erik De Clercq
DOI:10.1021/jm9801455
日期:1998.10.1
tumors. In general, Mannich bases containing olefinic bonds were more cytotoxic than the analogues without this functional group, while the piperidines 9 and 11 were more potent than the acyclic analogues 1 and 4, respectively. Correlations were noted between various physicochemical constants in the aryl rings and cytotoxicity. Compound 9d displayed promising in vivo activity against colon cancers. This
完成了一系列1-芳基-5-二乙基氨基-1-戊-3-酮盐酸盐1和1-芳基-3-二乙基氨基-1-丙烷盐酸盐4的合成。尝试制备相应的双(5-芳基-3-氧代-4-戊烯基)乙胺盐酸盐2和双(3-芳基-3-氧代丙基)乙胺盐酸盐5导致形成一系列4-(β-芳基乙烯基) )-3-(β-芳基乙烯基酮)-1-乙基-4-哌啶醇盐酸盐9和4-芳基-3-芳基酮-1-乙基-4-哌啶醇盐酸盐11盐10和12。这些化合物的结构通过1 H NMR光谱确定,并通过代表性分子的X射线晶体学证实。大多数化合物对鼠P388和L1210细胞以及人类肿瘤均表现出明显的细胞毒性。通常,含有烯键的曼尼希碱比没有该官能团的类似物具有更高的细胞毒性,而哌啶9和11分别比无环类似物1和4更有效。注意到芳基环中各种物理化学常数与细胞毒性之间的相关性。化合物9d显示出抗结肠癌的有希望的体内活性。这项研究表明,哌啶9和11构成了新型的细胞毒剂。化合物9
Enzymatic Primary Amination of Benzylic and Allylic C(sp<sup>3</sup>)–H Bonds
作者:Zhi-Jun Jia、Shilong Gao、Frances H. Arnold
DOI:10.1021/jacs.0c03428
日期:2020.6.10
processes are reported for their synthesis, methods that directly install a primary amine group into C(sp3)-H bonds remain unprecedented. Here, we report a set of new-to-nature enzymes that catalyzes the direct primary amination of C(sp3)-H bonds with excellent chemo-, regio-, and enantioselectivity, using a readily available hydroxylamine derivative as the nitrogen source. Directed evolution of genetically-encoded