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Synthesis 2004(3): 363-368
DOI: 10.1055/s-2004-815923
DOI: 10.1055/s-2004-815923
PAPER
© Georg Thieme Verlag Stuttgart · New York
A Simple Procedure for the Side-Chain Substitution of 2-Alkyl-3H-quinazoline-4-thiones: Application in Synthesis
Further Information
Received
12 November 2003
Publication Date:
26 January 2004 (online)
Publication History
Publication Date:
26 January 2004 (online)
Abstract
Double lithiation of 2-alkyl-3H-quinazoline-4-thiones at nitrogen and at the α-hydrogen of the 2-alkyl group (Me, Et, Pr) has been achieved with n-butyllithium at -78 °C in anhydrous THF under nitrogen. Reactions of the dilithium reagents obtained with various electrophiles (iodomethane, iodoethane, 1-bromobutane, D2O, benzaldehyde, 4-anisaldehyde, butan-2-one, cyclohexanone, benzophenone, phenyl isothiocyanate, tetraisopropylthiuram disulfide) gave the corresponding modified 2-substituted 3H-quinazoline-4-thiones 4-22 in excellent yields.
Key words
3H-quinazoline-4-thiones - lithiation - organolithiums - electrophiles
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References
Permanent address: El-Hiti G. A.; Department of Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt.