Enantioselective Protonation of Silyl Enol Ether Using Excited State Proton Transfer Dyes
作者:Anjan Das、Suliman Ayad、Kenneth Hanson
DOI:10.1021/acs.orglett.6b02820
日期:2016.10.21
Enantiopure excited state proton transfer (ESPT) dyes were used for the asymmetric protonation of silylenolether. Under 365 nm irradiation, with 3,3′-dibromo-VANOL as the ESPT dye, up to 49% enantioselectivity with a 68% yield of product was observed at room temperature. The reaction is effective with a range of silylenolethers and can also be achieved with visible light upon the addition of triplet
Chiral Sulfinamide/Achiral Sulfonic Acid Cocatalyzed Enantioselective Protonation of Enol Silanes
作者:Elizabeth M. Beck、Alan M. Hyde、Eric N. Jacobsen
DOI:10.1021/ol201608a
日期:2011.8.19
The application of chiral sulfinamides and achiral sulfonic acids as a cocatalyst system for enantioselective protonation reactions is described. Structurally simple, easily accessible sulfinamides were found to Induce moderate-to-high ee's in the formation of 2-aryl-substituted cycloalkanones from the corresponding trimethylsilyl enol ethers.
Ishihara Kazuaki, Kaneeda Masanobu, Yamamoto Hisashi, J. Amer. Chem. Soc, 116 (1994) N 24, S 11179-11180