Synthesis of constrained mimics of a serine dipeptide is described. Triflated 3-hydroxypicolinic acid methyl ester was carbo-substituted using ethynylstannanes with Pd-catalysis to furnish 3-acetylenic pyridines which were hydrolysed and coupled to Ser(t-Bu)OMe before cyclization to 1-alkylidene-3-oxo-1,3-dihydropyrrolo [3,4-b]pyridine derivatives. Subsequent deprotection provided the dipeptide analogue.
Synthesis of constrained mimics of a serine dipeptide is described. Triflated 3-hydroxypicolinic acid methyl ester was carbo-substituted using ethynylstannanes with Pd-catalysis to furnish 3-acetylenic pyridines which were hydrolysed and coupled to Ser(t-Bu)OMe before cyclization to 1-alkylidene-3-oxo-1,3-dihydropyrrolo [3,4-b]pyridine derivatives. Subsequent deprotection provided the dipeptide analogue.