2007

Polyphenyl derivativesQ 0700 Synthesis of 4,5-Diaryl-1,2,3-benzenetricarboxylates by Reaction of 4-Hydroxycy-

clopent-2-en-1-one-2-carboxylates with Dimethyl Acetylenedicarboxylate. — The route involves the regioselective reaction of the dianion derived from β-ketoesters (I) or (VI) with 1,2-diketones (II) followed by the [4 + 2] cycloaddition reaction of theintermediate cyclopentenones with alkyne (IV) and extrusion of carbon monoxide. In the case of amide (IX), the regioisomeric cyclopentenone is formed. — (SHER, M.; FISCHER, C.; REINKE, H.; LANGER*, P.; Tetrahedron 63 (2007) 19, 4080-4086; Inst. Chem., Univ. Rostock, D-18059 Rostock, Germany; Eng.) — Klein

33- 088