Palladium-catalyzed ortho-C–H olefination of phenylalanine and phenylethylamine derivatives assisted by a removable picolinamide group has been achieved. This protocol shows broad substrate scope, functional tolerance and moderate to high yields, thus affording a practical approach for the direct modification of phenylalanine and phenylethylamine derivatives.
Lanthanum trifluoromethanesulfonate is an effective single-component catalyst for synthesizing a variety of amides directly from esters and amines under mild conditions. Highly selective amidation of esters and amines, as well as catalyst-controlled amidation of esters, demonstrated the effectiveness of the catalyst system.
Cobalt-Catalyzed C(sp<sup>2</sup>)–H Carbonylation of Amino Acids Using Picolinamide as a Traceless Directing Group
we report an efficient protocol for the C(sp2)–H carbonylation of amino acid derivatives based on an inexpensive cobalt(II) salt catalyst. Carbonylation was accomplished using picolinamide as a tracelessdirectinggroup, CO (1 atm) as the carbonyl source, and Co(dpm)2 as the catalyst. A broad range of phenylalanine derivatives bearing diverse functional groups were tolerated. Moreover, the method can