title: Cascade reactions: a new synthesis of 2-benzofuran-2-ylacetamides by sequential Pd(0)-catalyzed deallylation-Pd(II)-catalyzed aminocarbonylative heterocyclization of 1-(2-allyloxyaryl)-2-yn-1-ols.
abstract: A general and efficient synthesis of 2-benzofuran-2-ylacetamides 5 starting from 1-(2-allyloxyaryl)-2-yn-1-ols 1, amines 4, and CO, in the presence of catalytic amounts of PdI2 in conjunction with PPh3 and KI, has been developed based on the "sequential homobimetallic catalysis" concept, that is, a process in which two different complexes of the same metal, but in two different oxidation states, promote two catalytic cycles in sequence. The first cycle corresponds to a Pd(0)-catalyzed aminodeallylation of 1 with formation of the free phenol 2, which then undergoes Pd(II)-catalyzed aminocarbonylative heterocyclization to give the final product 5.
authors.affiliation: Dipartimento di Scienze Farmaceutiche and Dipartimento di Chimica, Università della Calabria, 87036 Arcavacata di Rende (Cosenza), Italy. b.gabriele@unical.it
authors.forename: Bartolo
authors.initials: B
authors.lastname: Gabriele
authors.forename: Raffaella
authors.initials: R
authors.lastname: Mancuso
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Salerno
authors.forename: Mirco
authors.initials: M
authors.lastname: Costa
mesh_terms: D000081:Acetamides / Q000737:chemistry*; D000498:Allyl Compounds / Q000737:chemistry*; D000588:Amines / Q000737:chemistry*; D001572:Benzofurans / Q000737:chemistry*; D002384:Catalysis; D003500:Cyclization; D008956:Models, Chemical; D010165:Palladium / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000081:Acetamides; D000498:Allyl Compounds; D000588:Amines; D001572:Benzofurans; D010165:Palladium