Access to Hetero-Benzyl Scaffolds via Transient-Ligand-Enabled Direct γ-C(sp<sup>3</sup>)–H Arylation of 3-Methylheteroarene-2-Carbaldehydes
作者:Chennakesava Reddy、Javed Y. Shaikh、Ramakrishna G. Bhat
DOI:10.1021/acs.joc.0c00154
日期:2020.6.5
β-benzyl-substituted 5-memberedheterocyclic carbaldehydes via transient directing-group-enabled direct γ-C(sp3)–H arylation of 3-methylheteroarene-2-carbaldehydes. A wide range of 3-methylheteroarene carbaldehydes undergo coupling with a variety of aryl iodides, including less reactive iodo pyridine derivatives to provide a library of highly selective functionalized products in good to excellent yields. Some of these
Enantioselective intramolecular dearomative Heck reactions have been developed by Pd-catalyzed cross-coupling of aryl halides or aryl triflates with the internal C═C bond of indoles, benzofurans, pyrroles, and furans. A variety of structurally unique spiroheterocycles and benzofused heterocycles having N/O-substituted quaternary carbon stereocenters, and exocyclic olefin moieties were afforded in moderate
An efficient catalytic strategy toward the synthesis of N-substituted 3-methylindoles from inactive o-dihaloarenes and N-allylamines was developed by using a 1,3-bis(2,6-diisopropylphenyl)acenaphthoimidazol-2-ylidene (AnIPr)-ligated oxazoline palladacycle. It enabled a very broad substrate scope tolerating different functional groups, electronic properties, and steric bulkiness and afforded desired