S-三氟甲基亚砜亚胺和S-三氟甲基亚砜亚胺基亚胺是用于CF 3基团的亲电或自由基后期引入的重要试剂。我们在本文中披露了对我们以前的方法学及其大规模应用的重新评估。无需纯化即可制备超过30 g的关键亚砜亚胺4和40 g S-三氟甲基亚磺酰亚胺基亚胺5。为了确保过程安全,已对粗混合物和分离出的化合物进行了DSC测量。合成的成本也进行了详细讨论。
efficient one‐pot synthesis of S‐perfluoroalkylated NH‐sulfoximines from sulfides has been developed using phenyliodine diacetate (PIDA) and ammonium carbamate. Remarkable rate enhancement with trifluoroethanol was observed, presumably due to H‐bonding effects. These mild and metal‐free conditions are compatible with ‐CH2F, ‐CFCl2, ‐CF2H, ‐CF2Br, ‐C4F9, and ‐CF3 groups, in both the alkyl‐ and aryl series. Based
使用二碘苯基碘二乙酸酯(PIDA)和氨基甲酸铵开发了一种通用的由硫化物有效地单锅合成S-全氟烷基化NH-亚磺酰亚胺的方法。观察到三氟乙醇显着提高了速率,这可能是由于氢键作用所致。这些温和且无金属的条件在烷基和芳基系列中均与-CH 2 F,-CFCl 2,-CF 2 H,-CF 2 Br,-C 4 F 9和-CF 3基团兼容。根据19 F NMR分析,λ 6,提出了-acetoxysulfanenitrile中间体。
Sulfilimines and Sulfoximines by Reaction of Nitriles with Perfluoroalkyl Sulfoxides
perfluoroalkylated sulfoxides with trifluoromethanesulfonic anhydride behaves as highly electrophilic entities. Their reaction with nitriles allows a Ritter-like process leading to the new fluorinated acylsulfilimines 1–21 after hydrolysis. This flexible methodology allows some variation of both the sulfoxide and nitrile components. Derived acylsulfoximines 22–25 or free sulfoximines 26–28 could be selectively
We describe the preparation of S-perfluoroalkyl benzodithiazole trioxides as radical perfluoroalkylating reagents. Their syntheses were performed on a multi-gram scale by an oxidative cyclization connecting the nitrogen of a sulfoximine and a sulfur atom previously introduced in the ortho position of this group. The structures and properties of these new molecules were carefully examined by X-Ray diffraction
我们描述了作为自由基全氟烷基化试剂的S-全氟烷基苯并二噻唑三氧化物的制备。他们的合成是通过氧化环化以多克规模进行的,该氧化环化将亚砜亚胺的氮与先前引入该基团邻位的硫原子连接起来。通过 X 射线衍射、DFT 计算和循环伏安法仔细检查了这些新分子的结构和性质。这些数据清楚地突出了这些环状亚砜亚胺与其开放类似物相比的增强的反应性。光氧化还原催化实验证实了这一点,该实验揭示了有趣的反应性,尤其是对于二氟烷基链和单氟烷基链的引入。
A Mild and Efficient Procedure for the N-Functionalization of S-Perfluoroalkylated Aryl Sulfoximines
N-Acylated perfluoroalkylated sulfoximines are synthesized easily from the corresponding free NH-sulfoximines on reaction with acid chlorides. This mild procedure is extended to diacid chlorides for the preparation of dimeric N-bridged sulfoximines and to reactions with chloroformates, carbamoyl chlorides, chlorothionoformates and thiocarbamoyl chlorides as electrophiles.
Functionalized S-perfluorinated sulfoximines: Preparation and evaluation in catalytic processes
N-substituted S-perfluoroalkylated sulfoximines were synthesized from the NH sulfoximines either by a copper coupling reaction with aryl halides or by a reaction with electrophilic substrates. The procedure allowed the preparation of N,N'-bridged bis sulfoximines and of thioureas. The potential of these new sulfoximines was evaluated in different catalytic processes. (C) 2015 Elsevier B.V. All rights reserved.