Ein neues Verfahren zur positionsselektiven Einf�hrung von Trifluormethylgruppen in Heteroaromaten: Synthese von 3-Trifluormethylfuranen
摘要:
Transformation of 4,4-bis(trifluoromethyl)-1-oxabuta-1,3-dienes (2) into 2-fluoro-3-trifluoromethylfurnas (4) can be achieved in a two step procedure by treatment with tin (II) chloride and sodium hydride. The fluorine atom at skeleton position 2 is replaced smoothly by various nucleophiles. The reaction sequence represents a preparatively simple method for the selective introduction of biologically relevant substituents into 3-trifluoromethylfurans.