A direct amidation of carboxylicacids with tertiary amines could be carried out in the presence of the Ph3P–I2 activator. With an appropriate reagent addition sequence, a range of carboxylicacids including aliphatic, allylic, and aromatic acids could be converted into their corresponding tertiary amides under mild conditions without requirement of metal catalysis.
A highly regioselective three-component domino Heck-Negishi coupling reaction has been developed. Organozinc reagents are used to trap an alkylpalladium intermediate of olefins for a first example in the domino Heck reaction. This reaction is applicable to acrylates (or acrylamides) and purine compounds, producing a series of novel purine compounds with carbon substituents at the C6 position in moderate to good yields.