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High-throughput synthesis of N3-acylated dihydropyrimidines combining microwave-assisted synthesis and scavenging
Doris Dallinger1, Nikolay Yu Gorobets, C Oliver Kappe
1Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstrasse 28, A-8010 Graz, Austria.
Organic Letters
|April 12, 2003
Abstract:
[reaction: see text] The solution-phase synthesis of N3-acylated dihydropyrimidines was achieved utilizing microwave flash heating both in the synthesis (acylation) and purification (scavenging) steps. Quenching times for excess anhydrides using polystyrene or silica-supported diamine sequestration reagents were reduced from several hours to minutes utilizing microwave irradiation. The use of water as sequestration agent, coupled with an efficient solid-phase extraction workup technique allowed the rapid generation of a 20-member library of N3-acylated dihydropyrimidines.