The traceless cleavage of Rink amide resin to form thiazoles has been achieved using commercially available reagents. Conversion of Rink amide species to thioamides by use of Lawesson's reagent prepares the resin bound substrates for traceless cleavage. Cleavage using limiting amounts of alpha-haloketones provides thiazole bearing compounds of high purity. (C) 2000 Elsevier Science Ltd. All rights reserved.
Iron-Catalyzed Direct C-H Arylation of Heterocycles and Quinones with Arylboronic Acids
The arylation of C–H bonds to generate heteroaryl–aryl (Het–Ar) and arylated quinone (Quin–Ar) compounds has received great attention to achieve sustainable goals in synthetic chemistry. Despite significant advances, arylation of a broad range of Het–Ar and Quin–Ar derivatives remains a challenging task. Herein, a variety of heterocycles are arylated by using arylboronic acids in the presence of catalytic