An Unexpected Directing Effect in the Asymmetric Transfer Hydrogenation of α,α-Disubstituted Ketones
作者:Rina Soni、John-Michael Collinson、Guy C. Clarkson、Martin Wills
DOI:10.1021/ol201643v
日期:2011.8.19
alpha,alpha-Disubstituted ketones containing an aromatic ring or alkene are reduced in high enantiomeric excess using an asymmetric transfer hydrogenation catalyst. The sense of reduction indicates that the unsaturated region of the ketone adopts a position adjacent to the Ru-bound eta(6)-arene ring in the reduction transition state.
Aromatization of 1,4-cyclohexadienes with tetracyanoethylene: a case of varying mechanisms
作者:Barry M. Jacobson、Patricia Soteropoulos、Sheila Bahadori
DOI:10.1021/jo00249a020
日期:1988.7
Warnhoff, E. W.; Wong, Margaret Y. H.; Raman, P. Sundara, Canadian Journal of Chemistry, 1981, vol. 59, p. 688 - 696
作者:Warnhoff, E. W.、Wong, Margaret Y. H.、Raman, P. Sundara
DOI:——
日期:——
Chemoenzymatic Synthesis of Both Enantiomers of 3-Hydroxy-2,2-dimethylcyclohexanone
作者:Robert Chênevert、Carine Lévesque、Pierre Morin
DOI:10.1021/jo801954v
日期:2008.12.5
The stereoselective acetylation of meso-2,2-dimethyl-1,3-cyclohexanediol by vinyl acetate in the presence of three lipases gave the (1R,3S)-monoester in high enantiomeric excess (ee >= 98%). The hydrolysis of the corresponding meso-diacetate in the presence of Candida antarctica lipase in phosphate buffer provided the opposite enantiomer. Optically active monciacetates were converted to both enantiomers of 3-hydroxy-2.2-dimethylcyclohexanone, a versatile chiral building block.
Efficient Ruthenium-Catalyzed Transfer Hydrogenation/Hydrogenation of 1,3-Cycloalkanediones to 1,3-Cycloalkanediols Using Microwave Heating
作者:Karin Leijondahl、Ann-Britt L. Fransson、Jan-E. Bäckvall
DOI:10.1021/jo0612527
日期:2006.10.1
A number of 1,3-cycloalkanediones were efficiently reduced to the corresponding diols in good yield by the use of a ruthenium catalyst, 2-propanol, and hydrogen gas under microwave heating.