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2004
Pyrazine derivatives
R 0550
Highly Efficient Microwave-Assisted Fluorous Ugi and Post-Condensation Reacfor Benzimidazoles and Quinoxalinones. — A fluorous-based protocol for the
51- 134 tions
synthesis of quinoxalines (VI) and benzimidazoles (XI) is described. The process proceeds through microwave-promoted Ugi four-component reaction of the fluorous protected o-phenylene diamine (I), isolation of the Ugi products by fluorous solid-phase
extraction and subsequent deprotective cyclization. — (ZHANG*, W.; TEMPEST, P.;
Tetrahedron Lett. 45 (2004) 36, 6757-6760; Appl. Res. Cent., Univ. Pittsburgh,
Fluorous Technol., Inc., Pittsburgh, PA 15238, USA; Eng.) — Mais
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