Kinetic Resolution of <i>sec</i>
-Thiols by Enantioselective Oxidation with Rationally Engineered 5-(Hydroxymethyl)furfural Oxidase
作者:Mathias Pickl、Alexander Swoboda、Elvira Romero、Christoph K. Winkler、Claudia Binda、Andrea Mattevi、Kurt Faber、Marco W. Fraaije
DOI:10.1002/anie.201713189
日期:2018.3.5
Various flavoproteinoxidases were recently shown to oxidize primary thiols. Herein, this reactivity is extended to sec‐thiols by using structure‐guided engineering of 5‐(hydroxymethyl)furfural oxidase (HMFO). The variants obtained were employed for the oxidative kinetic resolution of racemic sec‐thiols, thus yielding the corresponding thioketones and nonreacted R‐configured thiols with excellent
importance in various realms of chemistry, furan occupies a position of eminence among heterocycles. Despite the availability of many methodologies for the synthesis of variably substitutedfurans, a modular convenient synthesis of 2,4-disubstituted furans remains challenging. The present work attempts to bridge that gap through a novel annulation-based approach using feedstock chemicals such as methyl ketones
[EN] N 4-MODIFIED CYTIDINE NUCLEOTIDES AND THEIR USE<br/>[FR] NUCLÉOTIDES DE CYTIDINE MODIFIÉS EN POSITION N 4 ET LEUR UTILISATION
申请人:UNIV VILNIUS
公开号:WO2019053609A1
公开(公告)日:2019-03-21
The present invention describes W-position modified cytidine nucleotides of formula (I). Provided herein are methods of chemical synthesis of ΛΡ-modified cytidine nucleoside triphosphates and their applications as well as uses of the cytidine analogues for the synthesis of modified nucleic acids. The nucleic acid molecule comprises DNA, RNA or a combination of DNA/RNA. One of many applications of modified cytidine nucleotides described herein is enzyme selection, when an enzyme of interest bears an activity of an esterase, amidase, oxidoreductase, lyase, ligase or other enzymatic activity, formula (I) wherein the substituants are as defined in the appended claims.
Reformatsky regants are shown to undergo facile CC bond formation on trithiocarbonates, xanthates, thione and dithioesters, through carbophilic additional yielding products formed by elimination of either sulphur or alkylthio group.
Dithiazoles and related compounds. Part 3. Preparation of 5H-1,4,2-dithiazoles via 1,3-dipolar cycloadditions between nitrile sulphides and thiocarbonyl compounds, and some conversions into 3,5-diaryl-1,4,2-dithiazolium salts
作者:Kwok-Fai Wai、Michael P. Sammes
DOI:10.1039/p19910000183
日期:——
Thermolysis of 1,3,4 -oxathiazol-2-ones 3 in the presence of thiocarbonyl compounds gives modest to good yields of the little-known 5H-1,4,2-dithiazoles 1, the reaction being successful with diaryl, aryl alkyl and dialkyl ketones, and thiono esters, but failing with dithio esters and tertiary thioamides. The influence of substituents is discussed. Solvolysis of 5-ethoxy-5H-1,4,2-dithiazoles, derived
在硫代羰基化合物的存在下,对1,3,4-氧杂噻唑-2-酮3的热解反应可得到中等程度的中等收率的鲜为人知的5 H -1,4,2-二噻唑1,该反应可成功地与二芳基,芳基烷基和二烷基酮,以及硫代酸酯,但不能与二硫代酯和叔硫代酰胺结合使用。讨论了取代基的影响。5-乙氧基-5 H -1,4,2-二噻唑类化合物,由硫代酸酯衍生,与高氯酸在乙酸酐中溶剂化,可高产率生成3,5-二芳基-1,4,2-二噻唑鎓盐9。