diverse five‐membered lactams from aliphaticamides and terminal acetylenes with the assistance of an 8‐aminoquinolyl auxiliary has been achieved. A broad range of terminal acetylenes and aliphaticamides proved to be the efficient coupling partners, furnishing the corresponding lactams in moderate to good yields. The transformation is proven to undergo an oxidative alkynylation followed by the intramolecular
A new method of cobalt-catalyzed synthesis of pyrrolidinones from aliphatic amides and terminal alkynes was discovered through a C-Hbond functionalization process on unactivated sp(3) carbons with the silver cocatalyst using a bidentate auxiliary. For the first time, a broad range of easily accessible alkynes are exploited as the reaction partner in C(sp(3))-H bondactivation to give the important
β-C(sp3)–H bonds of propioamides with organosilanes is described. The reaction proceeds with the assistance of an 8-aminoquinolyl auxiliary in a tandem way by the first oxidation of β-C(sp3)–H bonds and subsequent arylation/vinylation to give the aryloxylation/vinyloxylation products. This unusual aryloxy/vinyloxy forming reaction offers a new avenue for the functionalization of unactivated sp3 C–H
The nickel-catalyzed beta-thioetherification of unactivated C(sp(3))-H bond of propionamides is established with the assistance of 8-aminoquinoline auxiliary, leading to the beta-thio carboxylic acid derivatives. A broad range of functional groups is compatible with this thioetherfication reaction. The process represents the first successful example of metal-catalyzed C-S bond formation from unactivated C(sp(3))-H bonds.
Nickel-Catalyzed Direct C (sp<sup>3</sup>)–H Arylation of Aliphatic Amides with Thiophenes
Nickel-catalyzed heteroarylation of the inactive methyl C(sp(3))-H bond of aliphatic amide with heteroarenes is described. The method takes advantage of chelation assistance by an 8-aminoquinolinyl moiety. The synthetic reaction has good tolerance toward functional groups, and it can be used in the construction of various hinds of alkyl-substituted heteroarenes.