β-Aminoethyltrifluoroborates: Efficient Aminoethylations via Suzuki−Miyaura Cross-Coupling
摘要:
A set of phenethylamines has been successfully prepared via Suzuki-Miyaura cross-coupling of diverse potassium beta-aminoethyltrifluoroborates with aryl halides. The potassium beta-aminoethyltrifluoroborates were easily prepared via hydroboration of enamine and enamide precursors.
Reductive N-Arylethylation of Aromatic Amines and N-Heterocycles with Enol Ethers
作者:Franz Bracher、Katharina Vögerl、Duc Ong
DOI:10.1055/s-0036-1591859
日期:2018.3
N-arylethylation of aromatic amines and heterocycles under mild reductive conditions was developed using (2-methoxyvinyl)(hetero)arenes as building blocks and triethylsilane/trifluoroacetic acid as reducing agent. This protocol is compatible with numerous functional groups, and aliphatic amines are inert due to protonation. A convenient method for N-arylethylation of aromatic amines and heterocycles under
Olefin-Oriented Selective Synthesis of Linear and Branched N-Alkylated Heterocycles by Hydroamination
作者:Sushmita、Trapti Aggarwal、Kapil Mohan Saini、Akhilesh K. Verma
DOI:10.1002/ejoc.202000373
日期:2020.6.16
Selective base‐Mediated hydroamination of N‐heterocycles with olefins for the construction of Linear and branched N‐alkylated heterocycles is described. This protocol provided the synthesis of exclusive N‐alkylated product instead of the C‐3 Michael addition product.
Substrate-Controlled Regio- and Stereoselective Synthesis of (<i>Z</i>)- and (<i>E</i>)-<i>N</i>-Styrylated Carbazoles, Aza-carbazoles, and γ-Carbolines via Hydroamination of Alkynes
作者:Vineeta Garg、Pradeep Kumar、Akhilesh K. Verma
DOI:10.1021/acs.joc.8b01642
日期:2018.10.5
substrate-controlled regio- and stereoselective hydroamination of carbazoles, aza-carbazoles, and γ-carbolines with functionalized aromatic as well as aliphatic alkynes in a KOH/DMSO system in good yields. The electronic effect of the substrates governs the stereochemistry of the product. Electron-donating alkynes provided (Z)-stereoselective products, and electron-withdrawing alkynes provided (E)-stereoselective
Synthesis of
<i>N</i>
‐Alkyl and
<i>N‐H</i>
‐Carbazoles through S
<sub>N</sub>
Ar‐Based Aminations of Dibenzothiophene Dioxides
作者:Atsushi Kaga、Keisuke Nogi、Hideki Yorimitsu
DOI:10.1002/chem.201903916
日期:2019.11.22
Alkyl amines have become available for the synthesis of diverse N-alkyl carbazoles through twofold SN Ar aminations of dibenzothiophene dioxides by using alkali metal bases. Of particular importance is the choice of counter cations on alkali metal bases, that is, i) the use of Li base for the efficient intermolecular reaction and ii) the sequential addition of heavier alkali metal bases (Na, K, or
Efficient Copper-Catalysed Synthesis of Carbazoles by Double N-Arylation of Primary Amines with 2,2′-Dibromobiphenyl in the Presence of Air
作者:Tran Quang Hung、Tuan Thanh Dang、Peter Langer、Ha Nam Do、Nguyen Minh Quan、Ban Van Phuc、Dinh Van Tinh、Nguyen Quyet Tien、Truong Thi Thanh Nga、Van Tuyen Nguyen
DOI:10.1055/s-0040-1706641
日期:2021.4
An efficient Cu-catalyzed synthesis of carbazole derivatives is reported, which proceeds by double C–N coupling reactions of 2,2′-dibromobiphenyl and amines in the presence of air. The reaction is robust, proceeds in high yields, and tolerates a series of amines including neutral, electron-rich, electron-deficient aromatic amines and aliphatic amines.