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- W2151190117 abstract "The synthesis of 4-aryl-2-(thioxo)oxo-3,4-dihydropyrimidine-5-carboxylic acids is reported using two orthogonal solid-phase variations of the Biginelli condensation. In the first method, polymer-bound β-ketoesters are treated with aromatic aldehydes and urea under acidic conditions. The transient N-acyliminium ion that is initially formed from the aldehyde and urea precursors, is then intercepted by the resin-bound β-ketoesters. In an alternative approach, resin-bound β-ketoesters are condensed with aldehydes and O-methylisourea under basic conditions. Both orthogonal condensation procedures provide fair to excellent overall yields of the desired target structures." @default.
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- W2151190117 date "2001-01-01" @default.
- W2151190117 modified "2023-10-14" @default.
- W2151190117 title "Solid-Phase Synthesis of Dihydropyrimidones via N-Acyliminium Ion-Based α-Ureidoalkylations" @default.
- W2151190117 cites W203991865 @default.
- W2151190117 doi "https://doi.org/10.1055/s-2001-14608" @default.
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