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2004
Pyrrole derivatives
R 0120
Catalytic Multicomponent Synthesis of Highly Substituted Pyrroles Utilizing
One-Pot Sila-Stetter/Paal—Knorr Strategy. — The title method employs an acyl
45- 126 aanion
conjugate addition reaction of acylsilanes (sila-Stetter) and unsaturated ketones
generating 1,4-dicarbonyl compounds in situ. Tri- and tetrasubstituted pyrroles are obtained in good yields. Application of various amines promotes a Paal—Knorr reaction
affording the desired pyrrole nucleus in an efficient one-pot process. The microwave-assisted reaction produces (IVb) in 3% of the time compared to the conventional
method and in good yield. — (BHARADWAJ, A. R.; SCHEIDT*, K. A.; Org. Lett. 6
(2004) 14, 2465-2468; Dep. Chem., Northwest. Univ., Evanston, IL 60208, USA;
Eng.) — Steudel
2004
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