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|Title:||Catalytic one-pot diastereoselective Michael-initiated ring-closure of methyl ketones with 3-bromochromones: synthesis of cyclopropa[b]chromanones|
|Author:||Sousa, Joana L. C.|
Mendes, Ricardo F.
Paz, Filipe A. Almeida
Silva, Artur M. S.
Small ring systems
|Abstract:||A one-pot diastereoselective base-catalyzed Michael-initiated ring-closure (MIRC) of activated methyl ketones with 3-bromochromones to give cyclopropa[b]chromanones is described. Three asymmetric centres are generated in the new cyclopropa[b]chromanone skeleton. Stereochemistry studies based on NMR spectroscopy and single-crystal X-ray diffraction analysis revealed the trans configuration of the cyclopropane ring, with the (1R,1aS,7aR)/(1S,1aR,7aS) pair of enantiomers, as was further confirmed by chiral HPLC. The use of acetone in our reaction produced a 1-acetyl-substituted cyclopropa[b]chromanone that can undergo a subsequent MIRC reaction with a second molecule of 3-bromochromone to give the first described 1,1′-carbonylbis(cyclopropa[b]chromanone) dimers as a meso form.|
|Appears in Collections:||CICECO - Artigos|
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|Catalytic One-Pot Diastereoselective Michael-Initiated Ring-Closure of Methyl Ketones with 3-Bromochromones Synthesis of Cyclopropa[b]chromanones_10.1002ejoc.201600413.pdf||755.74 kB||Adobe PDF|
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