Visible-Light-Mediated α-Ketoacylations of <i>N</i>H-Sulfoximines with <i>gem</i>-Difluoroalkenes
作者:Yongliang Tu、Peng Shi、Carsten Bolm
DOI:10.1021/acs.orglett.1c04254
日期:2022.1.28
A photochemicalapproach for the preparation of α-keto-N-acyl sulfoximines from NH sulfoximines and gem-difluoroalkenes has been developed. In the presence of NBS, the reactions proceed in air without the need of a photocatalyst or additional oxidant. Results of mechanistic studies suggest that the two oxygens in the products stem from water and dioxygen.
已经开发了一种从N H 亚砜亚胺和偕二氟烯烃制备 α-酮基-N-酰基亚砜亚胺的光化学方法。在 NBS 的存在下,反应在空气中进行,无需光催化剂或额外的氧化剂。机理研究结果表明,产品中的两种氧来源于水和分子氧。
Synthesis of Alkylated Monofluoroalkenes via Fe-Catalyzed Defluorinative Cross-Coupling of Donor Alkenes with <i>gem</i>-Difluoroalkenes
作者:Ling Yang、Wei-Wei Ji、E Lin、Ji-Lin Li、Wen-Xin Fan、Qingjiang Li、Honggen Wang
DOI:10.1021/acs.orglett.8b00471
日期:2018.4.6
A reductive cross-coupling of gem-difluoroalkenes with diverse unactivated and heteroatom substituted olefins through a Fe-catalyzed hydrogen atom transfer (HAT) strategy is reported. Different from the previous HAT-type olefin cross-coupling reactions, the presence of a fluorineatom in the molecule results in a stereoselective β-F cleavage, leading to a C(sp2)–C(sp3) bond formation. A wide variety
Direct defluorinative amidation–hydrolysis reaction of <i>gem</i>-difluoroalkenes with <i>N</i>,<i>N</i>-dimethylformamide, and primary and secondary amines
作者:Biyun Wang、Xianghu Zhao、Qingyun Liu、Song Cao
DOI:10.1039/c8ob02322k
日期:——
A novel and efficient method for the synthesis of arylacetamides by the reactions of gem-difluoroalkenes with N,N-dialkylformamides, and primary and secondary amines with the assistance of KOtBu and water was developed.
开发了一种新颖有效的合成方法,该方法通过宝石-二氟烯烃与N,N-二烷基甲酰胺以及伯胺和仲胺在KO t Bu和水的反应下合成芳基乙酰胺。
Direct α-Monofluoroalkenylation of Heteroatomic Alkanes via a Combination of Photoredox Catalysis and Hydrogen-Atom-Transfer Catalysis
作者:Hao Tian、Qing Xia、Qiang Wang、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.9b01491
日期:2019.6.21
In this study, a new C(sp3)–H monofluoroalkenylation reaction involving cooperative visible-light photoredoxcatalysis and hydrogen-atom-transfer catalysis to afford products generated by selective hydrogen abstraction and radical–radical cross-coupling was described. This mild, efficient reaction shows high regioselectivity for the α-carbon atoms of amines, ethers, and thioethers and thus allows the
highly enantioselectivefluoroarylation of gem‐difluoroalkenes with aryl halides is presented by using a new chiral sulfinamide phosphine (Sadphos) type ligand TY‐Phos. N‐Me‐TY‐Phos can be easily synthesized on a gram scale from readily available starting materials in three steps. Salient features of this work including readily available starting materials, good yields, high enantioselectivities as well