jo5010636_si_001.pdf (3.46 MB)
Synthesis of Triarylmethanes by Palladium-Catalyzed C–H/C–O Coupling of Oxazoles and Diarylmethanol Derivatives
journal contributionposted on 2014-06-20, 00:00 authored by Sho Tabuchi, Koji Hirano, Tetsuya Satoh, Masahiro Miura
A PdCl2(MeCN)2/PPhCy2 catalyst couples oxazoles with diarylmethyl carbonates or pivalates to form the corresponding triarylmethanes in good yields. The catalysis involves successive secondary benzylic sp3 C–O and heteroaromatic sp2 C–H cleavages and provides an effective access to heteroarene-containing triarylmethanes from nonhalogenated and nonmetalated starting materials, which is complementary to precedented cross-coupling technologies with organic halides and organometallic reagents.