Divergent Gold(I)-Catalyzed Skeletal Rearrangements of 1,7-Enynes
作者:Rebecca Meiß、Kamal Kumar、Herbert Waldmann
DOI:10.1002/chem.201502843
日期:2015.9.21
The gold(I) complex catalyzed cycloisomerization and skeletal rearrangement of 1,n‐enynes (n=5–7) is a powerful methodology for the efficient synthesis of complex molecular architectures. In contrast to 1,6‐enynes, readily accessible homologous 1,7‐enynes are largely unexplored in such transformations. Here, the divergent skeletal rearrangement of all‐carbon 1,7‐enynes by catalysis with a cationic
Acrylic acid heterocyclic amides, fungicidal compositions and use
申请人:Celamerck GmbH & Co. KG
公开号:US04753934A1
公开(公告)日:1988-06-28
Compounds of the formula ##STR1## wherein A, B, R.sub.1, X and Q are substituents of various types, and acid addition salts thereof. The compounds are useful as fungicides.
Ir-Catalyzed Asymmetric Allylic Alkylation of Dialkyl Malonates Enabling the Construction of Enantioenriched All-Carbon Quaternary Centers
作者:Farbod A. Moghadam、Elliot F. Hicks、Zachary P. Sercel、Alexander Q. Cusumano、Michael D. Bartberger、Brian M. Stoltz
DOI:10.1021/jacs.2c02960
日期:2022.5.11
An enantioselective iridium-catalyzed allylicalkylation of malonates with trisubstituted allylic electrophiles to form all-carbon quaternary stereocenters is reported. This reaction proceeds at ambient temperature and enables the preparation of a wide range of enantioenriched products in up to 93% yield and 97% ee. The quaternary products can be readily converted to several valuable building blocks
报道了丙二酸酯与三取代的烯丙基亲电子试剂形成全碳季立构中心的对映选择性铱催化的烯丙基烷基化。该反应在环境温度下进行,能够以高达 93% 的产率和 97% 的 ee 制备范围广泛的对映体富集产品。季产品可以很容易地转化为几种有价值的结构单元,例如邻位季产品和 β-季酸。
(Imidazolylphenyl)pyrrol-2-one inhibitors of cardiac cAMP phosphodiesterase
作者:John W. Lampe、Yuo Ling Chou、Reda G. Hanna、Susan V. Di Meo、Paul W. Erhardt、Alfred A. Hagedorn、William R. Ingebretsen、Elinor Cantor
DOI:10.1021/jm00060a012
日期:1993.4
Seven 3-alkyl-4-aryl-1,5-dihydro-2H-pyrrol-2-ones were prepared as potential inhibitors of cardiac cAMP phosphodiesterase (PDE). The design of these compounds made use of rolipram, a known inhibitor of the brain cAMP PDE isozyme, as a lead structure and was guided by a model which describes the features required for potent inhibition of the cardiac isozyme. Syntheses for the new compounds are described, together with the results of theoretical and crystallographic studies aimed toward ascertaining their three-dimensional structures. The activities of these compounds as inhibitors of the cardiac and brain cAMP PDE isozymes and their positive inotropic activity in ferret papillary muscle are also reported. Selected compounds were further examined in an in vivo hemodynamic model. One compound,1,5-dihydro-4-[4-(1H-imidazol-1-yl)phenyl]-3-methyl-2H-pyrrol-2-one, was identified as a potent and selective positive inotropic agent and inhibitor of cardiac cAMP PDE.
Effect of A-strain on a diastereoselective synthesis of 6-hydroxy-4a-aryldecahydroisoquinolines; revised structures of N-acyliminium ion-polyene cyclization products