840
M. Zhang and Y.-Q. Li
4. Patil, A. D.; Kumar, N. V.; Kokke, W. C.; Bean, M. F.; Freyer, A. J.;
De Browse, C.; Mai, S.; Truneh, A.; Faulkner, D. J.; Carte, B.; Breen, A. L.;
Hertzberg, R. P.; Johnson, R. K.; Westley, J. W.; Potts, B. C. M. Novel
alkaloids from the sponge Batzella SP: Inhibitors of HIV gpl2O-human CD4
binding. J. Org. Chem. 1995, 60, 1182.
5. Hu, E. H.; Sidler, D. R.; Dolling, U. H. Unprecedented catalytic three-component
one-pot condensation reaction: An efficient synthesis of 5-alkoxy-carbonyl-4-aryl-
3,4-dihydrpyrimidin-2(1H)-ones. J. Org. Chem. 1998, 63, 3454.
6. Lu, J.; Wang, Z.; Yang, B.; Ma, H. One-pot synthesis of 3,4-dihydropyrimidin-
2(1H)-ones using lanthanum chloride as a catalyst. Tetrahedron Lett. 2000, 41,
9075.
7. Paraskar, A. S.; Dewkar, G. K.; Sudalai, A. Cu(OTf)2: A reusable catalyst for
high-yield synthesis of 3,4-dihydropyrimidin-2(1H)-ones. Tetrahedron Lett.
2003, 44, 3305.
8. Martins, M. A. P.; Teixeira, M. V. M.; Cunico, V.; Scapin, E.; Mayer, R.;
Pereira, M. P.; Zanatta, N.; Bonacorso, H. G.; Peppe, C.; Yuan, Y. F.
Indium(III) bromide–catalyzed one-pot synthesis of trichloromethylated tetra-
hydropyrimidinones. Tetrahedron Lett. 2004, 45, 8991–8994.
9. Reddy, C. V.; Mahesh, M.; Raju, P. V. K.; Babu, T. R.; Reddy, V. V. N.
Zirconium(IV) chloride–catalyzed one-pot synthesis of 3,4-dihydropyrimidin-
2(1H)-ones. Tetrahedron Lett. 2002, 43, 2657–2659.
10. Manjula, A.; Rao, B. V.; Neelakantan, P. An inexpensive protocol for Biginelli
reaction. Synth. Commun. 2004, 34 (14), 2665–2671.
11. Yadav, J. S.; Reddy, B. V. S.; Sridhar, P.; Reddy, J. S. S.; Nagaiah, K.;
Lingaiah, N.; Saiprasad, P. S. Green protocol for the Biginelli three-component
reaction: Ag3PW12O40 as
a novel, water-tolerant heteropolyacid for the
synthesis of 3,4-dihydropyrimidinones. Eur. J. Org. Chem. 2004, 3, 552–557.
12. Xu, L. W.; Wang, Z. T.; Xia, C. G.; Li, L.; Zhao, P. Q. Improved protocol for
the three-component Biginelli reactions and Biginelli-like Mannich reactions of
carbamates, aldehydes, and ketones. Helv. Chim. Acta. 2004, 87 (10), 2608–2612.
13. Li, J. T.; Han, J. F.; Yang, J. H.; Li, T. S. An efficient synthesis of 3,4-dihydropyr-
imidin-2-ones catalyzed by NH2SO3H under ultrasound irradiation. Ultrason.
Sonochem. 2003, 10, 119–122.
14. Shaabani, A.; Bazgir, A.; Teimouri, F. Ammonium chloride–catalyzed one-pot
synthesis of 3,4-dihydropyrimidin-2-(H)-ones under solvent-free conditions.
Tetrahedron Lett. 2003, 44, 2757.
15. Tu, S. J.; Fang, F.; Zhu, S. L.; Li, T. J.; Zhang, X. J.; Zhuang, Q. Y. A new Biginelli
reaction procedure using potassium hydrogen sulfate as the promoter for an
efficient synthesis of 3,4-dihydropyrimidin-2(1H)-one. Synlett 2004, 537–539.
16. Peng, J. J.; Deng, Y. Q. Ionic liquids–catalyzed Biginelli reaction under solvent-
free conditions. Tetrahedron Lett. 2001, 42, 5917–5919.
17. Min, X.; Wang, S. H.; Yuan, W. B. Lewis acid–catalyzed electrophilic substi-
tution of indole with aldehydes and Schiff’s base under microwave solvent-free
irradiation. Synth. Commun. 2004, 34 (17), 3175–3182.
18. Bose, D. S.; Kumar, R. K.; Fatima, L. A remarkable rate acceleration of the one-pot
three-component cyclo-condensation reaction at room temperature: An expedient
synthesis of mitotic Kinesin Eg5 inhibitor monastrol. Synlett 2004, 279–282.
19. Gangadasu, B.; Palaniappan, S.; Rao, V. J. One-pot synthesis of dihydropyrimidi-
nones using polyaniline-bismoclite complex. A facile and reusable catalyst for the
Biginelli reaction. Synlett 2004, 1285–1287.