Titanium/Palladium-Mediated Regioselective Propargylation of Ketones using Propargylic Carbonates as Pronucleophiles
作者:Alba Millán、Luis Álvarez de Cienfuegos、Ana Martín-Lasanta、Araceli G. Campaña、Juan M. Cuerva
DOI:10.1002/adsc.201000655
日期:2011.1.10
for the synthesis of homopropargylic alcohols usingpropargyliccarbonates as pronucleophiles is reported. The reaction is based on a combination of transition metal (palladium) and radical chemistry (titanium). The reaction takes place with an excellent regioselectivity and tolerates a great degree of substitution of the starting propargyliccarbonate, thus being an interesting tool in the context
γ-lactonization of homopropargyl alcohols via an alkyne deprotonation/boronation/oxidation sequence has been developed. Oxidation of the generated alkynyl boronate affords the corresponding ketene intermediate, which is trapped by the adjacent hydroxy group to furnish the γ-lactone. We have optimized the conditions as well as examined the substrate scope and synthetic applications of this efficient one-pot
Selective propargylation of carbonyl compounds with allenylstannane/alkyllithium mixed reagents
作者:Masaaki Suzuki、Yasushi Morita、Ryoji Noyori
DOI:10.1021/jo00289a013
日期:1990.1
Efficient Synthesis of γ-Lactones via Gold-Catalyzed Tandem Cycloisomerization/Oxidation
作者:Chao Shu、Meng-Qi Liu、Yu-Zhe Sun、Long-Wu Ye
DOI:10.1021/ol302323a
日期:2012.9.21
A novel Au-catalyzed tandem cycloisomerization/oxidation of homopropargyl alcohols was developed. Various γ-lactones can be accessed readily by utilizing this strategy. Notably, the mechanism of this reaction is distinctively different from the related Ru-catalyzed reactions where the ruthenium vinylidene intermediate was proposed.