Spirohexadienone is a structural moiety present in several biologically active natural products isolated both from terrestrial and marine natural sources. This structural moiety is commonly and strictly related to the biological properties exhibited by the natural products. We show herein that the combination of intermolecular Heck reactions with a phenolic oxidation induced by hypervalent iodine form these structural moieties from Morita-Baylis-Hillman adducts in moderate to good overall yields.
Morita–Baylis–Hillman adducts as building blocks of heterocycles: a simple approach to 4-substituted pyrazolones, and mechanism investigation via ESI–MS(/MS)
作者:Rosimeire C. Barcelos、Lucas A. Zeoly、Manoel T. Rodrigues、Bruno R. V. Ferreira、Marcos N. Eberlin、Fernando Coelho
DOI:10.1007/s00706-015-1427-6
日期:2015.9
We describe herein an efficient approach for the preparation of 4-substituted 2,3-dihydro-1H-pyrazol-3-ones starting from Morita-Baylis-Hillman adducts. These heterocycles were obtained in two or three steps as single isomers with moderate to good overall yields. One efficient and alternative methodology for the synthesis of alpha-methyl-beta-ketoesters is also reported (up to 91 % yield). Additionally, the mechanism of formation of pyrazolones was investigated employing ESI-MS/MS reaction monitoring.
An easy access to halogenated and non-halogenated spiro-hexadienones
作者:Lucimara J. Martins、Bruno R.V. Ferreira、Wanda P. Almeida、Marcelo Lancellotti、Fernando Coelho
DOI:10.1016/j.tetlet.2014.07.114
日期:2014.9
Spirocyclohexadienones as an Uncommon Scaffold for Acetylcholinesterase Inhibitory Activity
作者:Ralph C. Gomes、Renata P. Sakata、Wanda P. Almeida、Fernando Coelho
DOI:10.2174/1573406414666181109114214
日期:2019.5.20
elderly people is the Alzheimer’s disease (AD). Patients affected by this progressive and neurodegenerative disease have severe memory and cognitive function impairments. Some medicines used for treating this disease in the early stages are based on inhibition of acetylcholinesterase. Population aging should contribute to increase the cases of patients suffering from Alzheimer'sdisease, thus requiring the