Indium-Catalyzed Direct Conversion of Lactones into Thiolactones and Selenolactones in the Presence of Elemental Sulfur and Selenium
作者:Norio Sakai、Shuhei Horikawa、Yohei Ogiwara
DOI:10.1055/s-0036-1591849
日期:2018.2
Abstract The direct conversion of lactones into thiolactones with elemental sulfur (S8) catalyzed by InCl3/PhSiH3 in a one-pot reaction is described. This catalytic system was successfully applied to the novel preparation of selenolactones from lactones and selenium. The direct conversion of lactones into thiolactones with elemental sulfur (S8) catalyzed by InCl3/PhSiH3 in a one-pot reaction is described
An indium-catalyzed reaction of lactones and a disilathiane leading to thiolactones is described. The direct synthesis of thiolactones from lactones with an appropriate sulfur source is one of the most attractive approaches in organic and pharmaceutical chemistry. In this context, we found an indium-catalyzed direct conversion of lactones into thiolactones in the presence of elemental sulfur and a
Synthesis of Isothiochroman-3-ones via Metal-Free Oxidative Cyclization of Alkynyl Thioethers
作者:Ying-Qi Zhang、Xin-Qi Zhu、Yang-Bo Chen、Tong-De Tan、Ming-Yang Yang、Long-Wu Ye
DOI:10.1021/acs.orglett.8b03462
日期:2018.12.7
A novel Brønsted acid-catalyzed oxidative C–H functionalization of alkynyl thioethers has been developed. This method allows the practical synthesis of valuable isothiochroman-3-ones in mostly moderate to good yields under mild reaction conditions and features a broad substrate scope and wide functional group tolerance. Moreover, this metal-free oxidation can also be used to promote formal N–H insertion
Synthesis and structure activity relationships of novel non-peptidic metallo-aminopeptidase inhibitors
作者:Sébastien Albrecht、Albert Defoin、Emmanuel Salomon、Céline Tarnus、Anders Wetterholm、Jasper Z. Haeggström
DOI:10.1016/j.bmc.2006.06.050
日期:2006.11
Racemic derivatives of 3-amino-2-tetralone were synthesised and evaluated for their ability to inhibit metallo-aminopeptidase activities. New compounds substituted in position 2 by methyl ketone, substituted oximes or hydroxamic acids as well as heterocyclic derivatives were evaluated against representative members of zinc-dependent aminopeptidases: leucine aminopeptidase (E.C. 3.4.11.1), aminopeptidase-N(E.C. 3.4.11.2), Aeronumas proteolytica aminopeptidase (E.C. 3.4.11.10), and the aminopeptidase activity of leukotriene A(4) hydrolase (E.C. 3.3.2.6). Several compounds showed K-i values in the low micromolar range against the 'one-zinc' aminopeptidases, while most of them were rather poor inhibitors of the 'two-zinc' enzymes. This interesting selectivity profile may guide the design of new, specific inhibitors of target mammalian aminopeptidases with one active site zinc. (c) 2006 Elsevier Ltd. All rights reserved.
Reductive Opening of Thiophthalan: A New Route To Functionalized Sulfur-Containing Compounds