Substrate-controlled Michael additions of the titanium(IV) enolate of lactate-derived ketone 1 to acyclic α,β-unsaturated ketones in the presence of a Lewis acid (TiCl4 or SnCl4) provide the corresponding 2,4-anti-4,5-anti dicarbonyl compounds in good yields and excellent diastereomeric ratios. Likely, the nucleophilic species involved in such additions are bimetallic enolates that may add to enones through cyclic transition states. Finally, further studies indicate that a structurally related β-benzyloxy chiral ketone can also participate in such stereocontrolled conjugate additions.
Substrate-Controlled Michael Additions of Chiral Ketones to Enones. -(FABREGAS, M.; GOMEZ-PALOMINO, A.; PELLICENA, M.; REINA, D. F.; ROMEA, P.; URPI*, F.; FONT-BARDIA, M.; Org. Lett. 16 (2014) 23, 6220-6223, http://dx.
The neurological work of Artur Galcerán i Granes is remarkable and significant. He was the founder of the first Catalan and Spanish neurological society: The Society of Psychiatry and Neurology of Barcelona in 1911, the forerunner of the Catalan Society of Neurology.
The Society of Psychiatry and Neurology of Barcelona founded in 1911 by Galcerán i Granés was the first neurological society and was a precursor of the Catalan Society of Neurology. It should be highlighted that in 2011 it will be 100 years since the founding of the first neurological society in Catalonia and Spain.
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