heteroarenes such as pyrroles and indoles undergo addition reactions to C-C triplebonds in the presence of a catalytic amount of Pd(OAc)(2) under very mild conditions, affording cis-heteroarylalkenes in most cases. The cleavage of aromatic C-H bonds is the possible rate-determining step in CH(2)Cl(2), and the addition of heteroaromatic C-H bonds to C-C triplebonds is in a trans-fashion.
Generation of Tertiary and Quaternary Stereocentres through Palladium-Catalysed Intramolecular Heck-Type Reactions for the Stereocontrolled Synthesis of Pyrrolo[1,2-<i>b</i>]isoquinolines
cyclizations proceeded in moderate to good yields (up to 81 %), but with low enantioselectivity when chiral phosphanes such as (R)-BINAP were used as ligands. However, enantiomerically pure 10-substituted pyrrolo[1,2-b]isoquinolines were efficiently obtained by a diastereoselective approach using chiral nonracemic pyrrolidines as substrates, generating a tertiary stereocentre.