Reported herein is the use of S‐perfluoroalkyl sulfilimino iminiums as a new source of RF radicals under visible‐light photoredox catalysis (RF=CF3, C4F9, CF2Br, CFCl2). These shelf‐stable perfluoroalkyl reagents, readily prepared on gram scale from the corresponding sulfoxide using a one‐pot procedure, allow the efficient photoredox‐induced oxyperfluoroalkylation of various alkenes using fac‐Ir(ppy)3
本文报道了在可见光光氧化还原催化下(R F = CF 3,C 4 F 9,CF 2 Br,CFCl 2)使用S-全氟烷基亚磺酰亚胺基亚胺作为R F自由基的新来源。这些易于储存的全氟烷基试剂可以通过一锅法从相应的亚砜以克为单位轻松制备,可以使用fac-Ir(ppy)3作为光催化剂,对各种烯烃进行有效的光氧化还原诱导的全氟烷基氧化。重要的是,进行了自旋俘获/电子顺磁共振实验以表征参与该自由基/阳离子过程的所有自由基中间体。
Pd-catalyzed Suzuki–Miyaura cross-coupling of [Ph 2 SR][OTf] with arylboronic acids
The Pd-catalyzed Suzuki–Miyaura cross-coupling of alkyl- and fluoroalkyl(diphenyl)sulfonium triflates with arylboronicacids was compared. The fluorine substitution on the alkyl groups of [Ph2SR][OTf] had a big influence on the reaction. Perfluoroalkyl(diphenyl)sulfonium triflates (2b–d) were unsuccessful participants in the Pd-catalyzed phenylation of arylboronicacid under the standard conditions because
比较了Pd催化的三氟甲基磺酸烷基酯和氟代烷基(二苯基)ulf与芳基硼酸的Suzuki-Miyaura交叉偶联。[Ph 2 SR] [OTf]烷基上的氟取代对反应有很大影响。在标准条件下,全氟烷基(二苯基)ulf三氟甲磺酸酯(2b–d)未能成功地参与Pd催化的芳基硼酸的苯基化反应,因为长链全氟烷基具有很强的负电性,而是经S R fn键断裂。多氟烷基三苯二氟es(2f–h)与芳基硼酸反应,由于de盐的去质子化和β-F消除的趋势,以非常低的收率得到苯基化产物。最终,发现(2,2,2-三氟乙基)三氟甲磺酸二苯基s(2e),三氟甲磺酸甲基或乙基(二苯基)i(2i或2j)和三氟甲磺酸三苯基s(2m)是比其他测试过的苯基硫salts盐更有效的试剂钯催化的苯基化反应,在温和条件下可提供更高的所需产物收率。
Efficient copper-induced coupling between NH-fluoroalkylated sulfoximines and aryl iodides or bromides
A high yielding, simple, and flexible copper-based system for N-arylation of fluorinated sulfoximines is reported. Best results were achieved using copper iodide in combination with DMEDA and Cs2CO3 to provide a wide range of N-arylated perfluoroalkylated sulfoximines. These conditions tolerate a great number of substituents on either aromatic cycle, including heteroaromatic rings, for the N-functionalization
据报道,用于氟化亚砜亚胺的N-芳基化的高产量,简单且灵活的铜基体系。碘化铜与DMEDA和Cs 2 CO 3组合使用可提供最佳的N-芳基化全氟烷基化亚砜基亚胺,从而获得最佳结果。这些条件容许任一芳香环上的许多取代基,包括杂芳香环,用于N-官能化。
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
of some intermediates formed by reaction of nitriles with perfluoroalkyl sulfoxides upon trifluoromethanesulfonicanhydride activation. Bistriflate ketal 3, precursor of sulfilimine 1, may undergo a rearrangement to sulfanyl nitrile 5 after triflic acid elimination under thermal conditions. With p-tolyl trifluoromethylsulfoxide, remote triflic acid elimination from intermediate 4 leads to benzamide