Iron-Catalyzed Methylation Using the Borrowing Hydrogen Approach
作者:Kurt Polidano、Benjamin D. W. Allen、Jonathan M. J. Williams、Louis C. Morrill
DOI:10.1021/acscatal.8b02158
日期:2018.7.6
developed using methanol as a C1 building block. This borrowing hydrogen approach employs a Knölker-type (cyclopentadienone)ironcarbonyl complex as catalyst (2 mol %) and exhibits a broad reaction scope. A variety of ketones, indoles, oxindoles, amines, and sulfonamides undergo mono- or dimethylation in excellent isolated yields (>60 examples, 79% average yield).
Synthesis of α-heterosubstituted ketones through sulfur mediated difunctionalization of internal alkynes
作者:Zhong Zhang、Yuzheng Luo、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1039/c9sc00568d
日期:——
Synthesis of α-heterosubstituted ketones was achieved through sulfur mediated difunctionalization of internal alkynes in one pot. The reaction design involves: phenyl substituted internal alkyne attacking triflic anhydride activated diphenyl sulfoxide to give a sulfonium vinyl triflate intermediate, hydrolysis to give an α-sulfonium ketone, and then substitution with various nucleophiles. This method
Synthesis of multisubstituted pyrroles via a CuI-catalyzed three-component coupling and a 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) / silica-gel promoted cyclization
作者:Wanli Chen、Lina Jin、Yinghong Zhu、Weimin Mo
DOI:10.3998/ark.5550190.0013.825
日期:——
Multisubstitutedpyrroles with a 2-sulfonamido-group were synthesized through a CuI-catalyzedthree-componentcoupling and a 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU) / silica-gelpromotedcyclization under mild conditions in moderate yields.
Palladium-catalyzed tandem oxidative annulation of α-amino ketones leading to 2-aroylindoles
作者:Tao-Shan Jiang、Long Dai、Yuhui Zhou、Xiuli Zhang
DOI:10.1016/j.tet.2019.130917
日期:2020.2
A simple synthesis of 2-aroylindoles via palladium-catalyzed tandem oxidative annulation directly from α-amino ketones has been developed. In this transformation, two-step reaction including oxidation of α-amino aetones to generate imine intermediates and subsequent palladium-catalyzed aerobic annulation to give 2-aroylindoles was compatible in onepot.
A Bronsted acid mediated N-O bond clevage for direct [small alpha]-amination of ketones has been developed through nitroso aldol reaction of less-reactive aromaticnitrosocompounds and silyl enol ethers having disilane...