carbonylation reactions, analogue coupling via base-metal, nickel catalysis has received less attention because of the easy formation of highly toxic and unreactive Ni(CO)4 species between Ni(0) and CO. To date, the use of inexpensive and widely available carbon monoxide (CO) gas for nickel-catalyzed carbonylation reaction remains challenging, and nickel-catalyzed four-componentcarbonylativereaction has not
过渡金属催化的羰基化是制备羰基化合物最直接的策略之一。然而,与成熟的贵金属催化羰基化反应相比,通过贱金属、镍催化的类似偶联反应较少受到关注,因为在 Ni(0) 和 CO 之间容易形成剧毒和非反应性 Ni(CO)4 物种迄今为止,使用廉价且广泛可用的一氧化碳 (CO) 气体进行镍催化羰基化反应仍然具有挑战性,并且尚未报道镍催化四组分羰基化反应。在这里,我们报告了在一个大气压 (1 atm) 的 CO 气体下,高选择性镍催化的烯烃四组分羰基化,以有效地获得一系列复杂的羰基化合物,包括在药物化学和化学生物学中非常感兴趣的氟化氨基酸和寡肽。该反应依赖于镍催化的一锅级联过程,在烯烃的碳碳双键上组装 CO、芳基硼酸、二氟烷基亲电试剂,为贱金属催化的羰基化级联反应开辟了新途径。
Synthesis of Enantioenriched α,α-Difluoro-β-arylbutanoic Esters by Pd-Catalyzed Asymmetric Hydrogenation
Synthesis of optically active gem-difluorinated organic molecules attracts a great deal of interest due to their unique properties in pharmaceutical and agrochemical areas. Herein, a series of enantioenriched α,α-difluoro-β-arylbutanoic esters were prepared in high yields (83–99%) with moderate to excellent enantioselectivities (≤97:3 er) by palladium-catalyzed asymmetrichydrogenation.
Ligand-Controlled Regiodivergent Palladium-Catalyzed Decarboxylative Allylation Reaction to Access α,α-Difluoroketones
作者:Ming-Hsiu Yang、Douglas L. Orsi、Ryan A. Altman
DOI:10.1002/anie.201410039
日期:2015.2.16
α,α‐Difluoroketones possess unique physicochemical properties that are useful for developing therapeutics and probes for chemical biology. To access the α‐allyl‐α,α‐difluoroketone substructure, complementary palladium‐catalyzed decarboxylative allylation reactions were developed to provide linear and branched α‐allyl‐α,α‐difluoroketones. For these orthogonal processes, the fluorination pattern of the
Copper-catalysed difluoroalkylation of aromatic aldehydes via a decarboxylation/aldol reaction
作者:Jin-Wei Yuan、Shuai-Nan Liu、Wen-Peng Mai
DOI:10.1039/c7ob01739a
日期:——
A copper-catalysed tandem decarboxylation/aldol reaction of simple aromaticaldehydes with 2,2-difluoro-3-oxo-3-arylpropanoic acid has been developed under mild conditions. This method provides a new route for the direct one-pot synthesis of difluorinated aldols in moderate to good yields from simple substrates.