Abstract
An efficient asymmetric synthesis of chiral β-amino acid ester derivatives containing a 4-(pyridin-3-yl)pyrimidin-2-yl amine moiety was developed. This catalytic asymmetric Mannich reaction gave target products in high yields (95%) and excellent enantioselectivities (>99% ee) using a cinchona-based squaramide catalyst under solvent-free, one-pot conditions. Antiviral bioassays indicated that some of the chiral products exhibited higher antiviral activities against tobacco mosaic virus than the commercial compound ribavirin.
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