REACTION OF PROPARGYL BROMIDE AND TRIMETHYLSILYLPROPARGYL IODIDE WITH METALLIC TIN, ALUMINUM, AND ALDEHYDES OR KETONES. SELECTIVE SYNTHESIS OF β-ACETYLENE, β-TRIMETHYLSILYLACETYLENE, AND α-TRIMETHYLSILYLALLENE ALCOHOLS
β-Acetylenic and α-allenic alcohols were synthesized selectively by the reaction of aldehydes and ketones with organotin compounds prepared by treatment of propargyl bromide or trimethylsilylpropargyl iodide with metallic tin and aluminum in a suitable solvent.
Efficient Propargylation of Aldehydes and Ketones Catalyzed by Titanocene(III)
作者:José Justicia、Iris Sancho-Sanz、Enrique Álvarez-Manzaneda、J. Enrique Oltra、Juan M. Cuerva
DOI:10.1002/adsc.200900479
日期:2009.10
We describe a novel method for the propargylation of a wide range of aldehydes and ketonescatalyzed by titanocene(III) complexes under mild reaction conditions and compatible with many functional groups. Homopropargylic alcohols are obtained as the sole products even when ketones are used as starting materials, which is unusual in Barbier-type propargylations.
CpTiCl<sub>2</sub>
, an Improved Titanocene(III) Catalyst in Organic Synthesis
作者:Esther Roldan-Molina、Natalia M. Padial、Luis Lezama、J. Enrique Oltra
DOI:10.1002/ejoc.201801120
日期:2018.11.25
CpTiCl2, an improved titanocene(III) single‐electron transfer catalyst, under mild conditions provides excellent yields of homoallylic and homopropargylic alcohols in Barbier‐type allylation and propargylation reactions. Moreover, in the presence of a BOX ligand, it was capable of catalyzingenantioselective intramolecular allylations and propargylations (cyclizations) of ketones.