The addition of 2-hydroxy-3-methylcyclopent-2-enone to propiolate esters is catalysed by triphenylphosphine to form O-vinylcyclopentenones in moderate yields.
Triphenylphosphine Catalyzed Stereoselective Synthesis of O-Vinylcyclopentenones. -The procedure described represents a simple entry into the synthesis of O-vinylcyclopentenones (III) thought as potentially synthetic intermediates. -(BAHARFAR*, R.; OSTADZADEH, A.; ABBASI, A.; J. Chem. Res., Synop. 2004, 1, 37-38; Dep. Chem., Mazandaran Univ., Babolsar 47415, Iran; Eng.) -H. Haber 34-072
Derivatives. -The reported reaction of maltol (I) with dialkyl acetylenedicarboxylates in the presence of triphenylphosphine offers a simple one-pot access towards hitherto unknown fused tricyclic systems of type (III). -(BAHARFAR*, R.; ASGHARI, S.; HAMEDANINEJAD, A.; ABBASI, A.; OSTADZADEH, A.; BIJANZADEH, H. R.; Lett.
The reaction of 2-methyl-3-hydroxy-4H-pyrane-4-one (maltol) with dialkyl acetylenedicarboxylates in the presence of triphenylphosphine in CH 2 Cl 2 at room temperature leads to the unknown fused furan and cyclobutene derivatives, and functionalized olefins in fairly high yields.
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