Methylenepyran unsaturated Fischer carbene complexes from gamma-methylpyrylium salts and alkynylcarbenes. Evolution to spiro-pyran-cyclopentenone compounds

作者：Ba Fatou; Le Poul Pascal; Robin Le Guen Francoise; Cabon Nolwenn; Caro Bertrand^*

来源：Tetrahedron Letters, 2010, 51(4): 605-608.

DOI：10.1016/j.tetlet.2009.11.072

• Push-pull molecules
• Methylenepyrans
• Fischer alkynylcarbenes complexes
• Spiro-fused-pyran-cyclopentenenone

Push-pull methylenepyran compounds 3 containing ferrocenyl or aryl groups are synthesized from reaction of condensation between gamma-methyl-pyrylium salts 1 as precursors of gamma-methylenepyrans and alkynylcarbene complexes 2 as Michael-type acceptors. The new carbenes 3 evolve in CH(2)Cl(2) Solution at room temperature to provide spiro-fused-pyran-cyclopenten e none 4 and polysubstituted cyclopentenones 5.

• 出版日期2010-1-27