The synthesis of novel, highly functionalized, C 2-symmetric sulfur-based catalysts is developed and their catalytic applications are explored in asymmetric bromo-, iodo- and seleno-functionalizations of alkenoicacids. This protocol provides the corresponding normal- and medium-sized bromo, iodo and selenolactones in up to 98% yield and 83% stereoselectivity.
开发了新型、高度官能化的 C 2 对称硫基催化剂的合成,并探索了它们在烯酸的不对称溴、碘和硒官能化中的催化应用。该方案以高达 98% 的产率和 83% 的立体选择性提供相应的正常和中等大小的溴、碘和硒内酯。
Copper(II) Acetate-Catalyzed Hydroxysulfenylation-Initiated Lactonization of Unsaturated Carboxylic Acids with Oxygen as Oxidant and Oxygenation Reagent
作者:Bingnan Du、Yang Wang、Haibo Mei、Jianlin Han、Yi Pan
DOI:10.1002/adsc.201700036
日期:2017.5.17
thiols has been explored. The reaction proceeds through a new hydroxysulfenylation-initiated lactonization pathway with carboxyl as electrophilic group, which provides an efficient access to assembly highly valuable thio-substituted lactone derivatives with good yields under mild conditions. Several control experiments, as well as an isotope labelling experiment disclose that oxygen acts as both oxidant
Cooperativity within the catalyst: alkoxyamide as a catalyst for bromocyclization and bromination of (hetero)aromatics
作者:Haripriyo Mondal、Md Raja Sk、Modhu Sudan Maji
DOI:10.1039/d0cc04673f
日期:——
Alkoxyamide has been reported as a catalyst for the activation of N-bromosuccinimide to perform bromocyclization and bromination of a wide range of substrates in a lipophilic solvent, where adequate suppression of the background reactions was observed. The key feature of the active site is the alkoxy group attached to the sulfonamide moiety, which facilitates the acceptance as well as the delivery
Synthesis of Chiral Sulfonyl Lactones via Copper-Catalyzed Asymmetric Radical Reaction of DABCO⋅(SO<sub>2</sub>
)
作者:Yang Wang、Lingling Deng、Jie Zhou、Xiaochen Wang、Haibo Mei、Jianlin Han、Yi Pan
DOI:10.1002/adsc.201701532
日期:2018.3.20
work, an asymmetriccopper‐catalyzed radical multi‐component cascade reaction of an unsaturated carboxylic acid, aryldiazonium tetrafluoroborate, and DABCO⋅(SO2)2 (DABSO) has been developed for the enantioselective synthesis of sulfonyl lactones. In this reaction, this SO2 surrogate, DABSO was applied for the first time in the construction of chiral compounds. This multiple‐step asymmetric radical reaction
Photoredox-Catalyzed Cascade Difluoroalkylation and Intramolecular Cyclization for Construction of Fluorinated γ-Butyrolactones
作者:Wanxing Sha、Wenzhong Zhang、Shengyang Ni、Haibo Mei、Jianlin Han、Yi Pan
DOI:10.1021/acs.joc.7b01279
日期:2017.9.15
difluoroalkylation and intramolecular cyclization reaction has been developed for the synthesis of difluoroalkylated oxygen heterocycles. The reaction was carried out under very mild conditions, affording fluorinated isobenzofuran-1-ones, lactone, and cyclic ethers with up to 97% chemical yields. Furthermore, several types of bromofluoroalkane precursors bearing ester, keto, amido, and phosphate groups could all work