Multicomponent synthesis of a new series of 4H-furo[3,4-b]pyrans, with iron(III) triflate as catalyst
We report the first efficient multicomponent reaction, catalyzed by iron(III) triflate, for synthesis of a new series of functionalized 4H-furo[3,4-b]pyran derivatives.
A Novel One-Step Synthesis of 4H-Furopyrans and a Transformation into a Difuropyridine
A simple one-step synthesis of 2-amino-4-aryl-5-oxo-4H-furopyran-3-carbonitriles 7 is described.It involves reaction of 2,4(3H,5H)-furandione (β-tetronic acid) (5) with arylmethylenemalononitriles 4 in basic medium.Some substituent effects are noted and the assignments of 13C-NMR spectra are discussed.Ring transformation of the furopyran 7a leads to the difuropyridine 9.Key Words: Furopyrans / Difuropyridine / β-Tetronic acid / Malononitriles, arylmethylene-
Martin, Nazario,Segura, Jose L.,Seoane, Carlos,Soto, Jose L.,Morales, Margarita,Suarez, Margarita
p. 827 - 830
(2007/10/02)
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