The enantioselective propargylic alkylation of propargylic alcohols with β‐ketoesters in the presence of a thiolate‐bridged diruthenium complex and a copper complex as co‐catalyst affords the corresponding propargylic alkylated products in excellent yields as a mixture of two diastereoisomers with high enantioselectivity (up to 95 % enantiomeric excess (ee)). The findings reported herein not only open
A sustainable access to ynones through laccase/TEMPO-catalyzed metal- and halogen-free aerobic oxidation of propargylic alcohols in aqueous medium
作者:Alana B.V. Silva、Emmanuel D. Silva、Alcindo A. dos Santos、Jefferson L. Princival
DOI:10.1016/j.catcom.2020.105946
日期:2020.4
Tuning laccase/TEMPO-catalyzed aerobic oxidation of secondary propargylic alcohols in aqueous media was accomplished in order to efficiently synthesize ynones. This study led to the formulation of an effective and sustainable catalytic method for the preparation of mono- and bis-substituted ynones compared with traditional oxidative methods.
Dehydrative Thiolation of Allenols: Indium vs Gold Catalysis
作者:S. Webster、P. C. Young、G. Barker、G. M. Rosair、A.-L. Lee
DOI:10.1021/jo502648w
日期:2015.2.6
Intermolecular additions of thiols to allenols via formal S(N)2' selectivity to produce functionalized dienes are described. Although this dehydrative reaction was initially developed using gold(I) catalysis, indium(III) proves to be a far superior catalyst in terms of selectivity and substrate scope.