Asymmetric Epoxidation with a Photoactivated [Ru(salen)] Complex
摘要:
(Nitrosyl)(salen)ruthenium(II) complex 1 was found to serve as an efficient catalyst for the epoxidation of conjugated olefins under photoirradiation, with 2,6-dichloropyridine N-oxide (2) or tetramethylpyrazine N,N'-dioxide as a stoichiometric oxidant. High enantioselectivity was achieved irrespective of the substitution pattern of olefins. The choice of solvent depends on stability of the resulting epoxides: high enantioselectivity is generally observed in the reaction with ethereal solvents, but use of benzene is recommended when the resulting epoxides are acid-sensitive.
Crystal Engineering with Iodoethynylnitrobenzenes: A Group of Highly Effective Halogen-Bond Donors
作者:Christer B. Aakeröy、Tharanga K. Wijethunga、John Desper、Marijana Đaković
DOI:10.1021/acs.cgd.5b00478
日期:2015.8.5
formation of a co-crystal driven by either C–I···N or C–I···O halogen bonds. The bromo-compound analogues displayed a 60% success rate whereas the chloro-analogues did not yield any co-crystals, emphasizing the importance of the magnitude of the electrostatic aspects of halogenbonding for practical supramolecular synthesis. Ten newcrystalstructures are presented and the outcome (in terms of stoichiometry
Synthesis, Biological Evaluation, and Pharmacokinetic Study of Novel Liguzinediol Prodrugs
作者:Zheng Liu、Wei Li、Hong-Mei Wen、Hui-Min Bian、Jing Zhang、Lei Chen、Long Chen、Kun-Di Yang
DOI:10.3390/molecules18044561
日期:——
Liguzinediol (LZDO) ester prodrugs 3–5 were synthesized and evaluated in vitro and in vivo for their potential use in prolonging the half-life of the parent drug LZDO (1a) in vivo. Prodrugs 3–5 were found to display a potent positive inotropic effect on the myocardium, without the risk of arrhythmia. Prodrugs 3–5 rapidly underwent enzymatic hydrolysis to release the parent compound LZDO in 1–3 h in rat liver microsomes and rat plasma. The half-life of the parent compound was prolonged after intragastric administration of prodrug 3, which was found to be a superior prodrug candidate for increasing myocardial contractility.
Cocrystals and Salts of Tetrazole-Based Energetic Materials
作者:Janaka C. Gamekkanda、Abhijeet S. Sinha、Christer B. Aakeröy
DOI:10.1021/acs.cgd.9b01620
日期:2020.4.1
Many energetic materials are unsuitable for practical purposes due to unacceptable sensitivity toward heat, impact, shock, or friction. In addition, chemical reactivity can also be of concern from the point of view of storage and shelf life. In order to develop new solid forms of energetic materials, several tetrazole-based energetic materials with suboptimal thermal and impact sensitivities were subjected