Ni-Catalyzed Reductive C–O Bond Arylation of Oxalates Derived from α-Hydroxy Esters with Aryl Halides
摘要:
A Ni-catalyzed reductive cross-coupling of alpha-hydroxycarbonyl compounds modified with oxalyl groups and aryl halides has been developed that furnishes alpha-aryl esters under mild conditions and tolerates a variety of functionalized aryl halides bearing electron withdrawing and-donating groups. This work highlights C-O bond fragmentation on secondary alkyl carbon centers that generates alpha-carbonyl radicals.
dialkoxycarbonylation of various aromatic and aliphatic alkynes affording a wide range of 1,4-dicarboxylic acid diesters in high yields and selectivities. Kinetic studies suggest the generation of 1,4-dicarboxylic acid diesters via cascade hydroesterification of the corresponding alkynes. Based on these investigations, the chemo- and regioselectivities of alkyne carbonylations can be controlled as shown by switching