An efficient synthesis of N-acetyl-2-substituted indole derivatives via direct intramolecular hydroamination of N-acetyl-2-alkynylaniline derivatives was developed. The reaction could be applied to a wide range of substrates employing only 1–2 mol% of PtCl4 as the catalyst to furnish the desired indole products in moderate to excellent yields. The current protocol is efficient, reliable and scalable
Palladium-Catalyzed, <i>ortho</i>-Selective C–H Halogenation of Benzyl Nitriles, Aryl Weinreb Amides, and Anilides
作者:Riki Das、Manmohan Kapur
DOI:10.1021/acs.joc.6b02731
日期:2017.1.20
ortho-selective C–H halogenation methodology is reported herein. The highlight of the work is the highly selective C(sp2)–H functionalization of benzyl nitriles in the presence of activated C(sp3)–H bond, which results in good yields of the halogenated products with excellent regioselectivity. Along with benzyl nitriles, aryl Weinrebamides and anilides have been evaluated for the transformation using aprotic
for the synthesis of 2-aminobenzothiazoles by copper-catalyzedtandemreaction has been developed. In the presence of CuBr and Cs 2 CO 3 , a variety of 2-haloanilines underwent the reaction with tetramethylthiuram disulfide (TMTD) efficiently to afford the corresponding 2-aminobenzothiazoles in moderate to excellent yields. The present process allows the construction of 2-aminobenzothiazoles from a
Efficient and Economical Access to Substituted Benzothiazoles: Copper-Catalyzed Coupling of 2-Haloanilides with Metal Sulfides and Subsequent Condensation
Don′t tell azole: The first metal‐catalyzed direct coupling of metalsulfides with aryl halides and subsequent intramolecular condensation provided substitutedbenzothiazoles (see scheme). A wide range of functional groups are tolerated under the reaction conditions.
Monoprotected <scp>l</scp>
-Amino Acid (<scp>l</scp>
-MPAA), Accelerated Bromination, Chlorination, and Iodination of C(sp<sup>2</sup>
)−H Bonds by Iridium(III) Catalysis
作者:Subban Kathiravan、Ian A. Nicholls
DOI:10.1002/chem.201700280
日期:2017.5.23
Halogenated arenes are important structural motifs commonly found in biologically active molecules and used for a variety of transformations in organic synthesis. Herein, we report the mono-protected L-amino acid (L-MPAA) accelerated iridium(III) catalyzed halogenation of (hetero)anilides at room temperature. This reaction constitutes the first example of an iridium(III)/L-MPAA catalyzed general halogenation