Nanolayered cobalt–molybdenum sulphides (Co–Mo–S) catalyse borrowing hydrogen C–S bond formation reactions of thiols or H<sub>2</sub>S with alcohols
作者:Iván Sorribes、Avelino Corma
DOI:10.1039/c8sc05782f
日期:——
Nanolayered cobalt–molybdenum sulphide (Co–Mo–S) materials have been established as excellent catalysts for C–S bond construction. These catalysts allow for the preparation of a broad range of thioethers in good to excellent yields from structurally diverse thiols and readily available primary as well as secondary alcohols. Chemoselectivity in the presence of sensitive groups such as double bonds,
Regioselective Synthesis of Selenide Ethers through a Decarboxylative Coupling Reaction
作者:Fei-Hu Cui、Jing Chen、Shi-Xia Su、Yan-li Xu、Heng-shan Wang、Ying-ming Pan
DOI:10.1002/adsc.201700676
日期:2017.11.23
An efficient and selective approach to the synthesis of selenide ethers containing one or two geminal C–Se bonds from readily available diselenides and phenylacetic acids was developed. Compounds containing one C–Se bond were prepared by employing air as the oxidant under metal-free conditions, whereas compounds having two geminal C–Se bonds were formed via the iron(III) chloride/oxygen/cesium carbonate
已开发出一种有效的,选择性的方法,可以从容易获得的二硒化物和苯乙酸合成含一个或两个双键C-Se键的硒醚。通过在无金属条件下将空气用作氧化剂来制备包含一个C-Se键的化合物,而通过氯化铁(III)/氧/碳酸铯(FeCl 3 / O 2)形成具有两个双键C-Se键的化合物。/ Cs 2 CO 3)系统。此外,在标准反应条件下,1,2-二苯基二硫烷也可以平稳地转化为相应的硫醚产物。
Origin of the Stereoselectivity in (Ethoxycarbonyl)-, Cyano-, and Phenyl-Substituted (Arylsulfinyl)methyl Radicals
carbonyl-substituted (arylsulfinyl)methylradicals is presented, based on experimental results and semiempirical calculations. The influence of dipole-dipole interactions, allylic 1,3-strain (A1,3 strain), allylic 1,2-strain (A1,2 strain), and coulombic interactions is discussed based on stereoselectivities observed with (alkoxycarbonyl)-, cyano-, and aryl-substituted (arylsulfinyl)methylradicals. In the second part
Enantioselective Sulfoxidation Catalyzed by a Bisguanidinium Diphosphatobisperoxotungstate Ion Pair
作者:Xinyi Ye、Adhitya Mangala Putra Moeljadi、Kek Foo Chin、Hajime Hirao、Lili Zong、Choon-Hong Tan
DOI:10.1002/anie.201601574
日期:2016.6.13
The first enantioselective tungstate‐catalyzed oxidation reaction is presented. High enantioselectivities were achieved for a variety of drug‐like phenyl and heterocyclic sulfides under mild conditions with H2O2, a cheap and environmentally friendly oxidant. Synthetic utility was demonstrated through the preparation of (S)‐Lansoprazole, a commercial proton‐pump inhibitor. The active ion‐pair catalyst
提出了第一个对映选择性钨酸盐催化的氧化反应。在温和的条件下,使用廉价且环保的氧化剂H 2 O 2可实现多种药物样的苯基和杂环硫化物的高对映选择性。通过制备商业化的质子泵抑制剂(S)-兰索拉唑证明了其合成用途。使用拉曼光谱法和计算研究,活性离子对催化剂被鉴定为双胍双磷酸双过氧钨酸盐。
Potentiation of the Cytotoxicity of Chloroethylnitrosourea by O6-Arylmethylguanines.
alkylating antitumor agents. In order to study the interaction of O6-benzylguanine derivatives with AGT and to obtain greater AGT depletion, we synthesized the following O6-arylmethylguanine derivatives and related compounds: O6-(4-, 3- and 2-fluorobenzyl)guanines (2, 3, 4), O6-(4-, 3- and 2-trifluoromethylbenzyl)guanines (5, 6, 7), O6-(4-, 3- and 2-pyridylmethyl)guanines (8, 9, 10), O6-(2- and 1-naphthylmethyl)guanines