Aldol-type reactions between trimethylsilyl enol ethers and acetals with the aid of rhodium complex
作者:Susumu Sato、Isamu Matsuda、Yusuke Izumi
DOI:10.1016/s0040-4039(00)96938-7
日期:——
Aldol-type reactions of trimethylsilyl enol ethers with acetals, ketals, and orthoesters are successfully performed with the aid of a catalytic amount of rhodium complex, Rh4(CO)12 or [Rh(COD)(DPPB)]+ClO4−, underneutral conditions.
Regioselective reductions of β,β-disubstituted enones catalyzed by nonracemically ligated copper hydride
作者:Karl R. Voigtritter、Nicholas A. Isley、Ralph Moser、Donald H. Aue、Bruce H. Lipshutz
DOI:10.1016/j.tet.2011.10.056
日期:2012.4
2-additions to β,β-disubstitutedα,β-unsaturatedketones have been further explored. Asymmetric reductions of enones lacking an α-substituent can be achieved with CuH complexed by DTBM-SEGPHOS in Et2O at −25 °C leading to the generation of highly valuable nonracemic allylic alcohols. The corresponding 1,4-reductions can also be achieved using the same reaction conditions by switching the ligand to a JOSIPHOS
A NEW PROCEDURE FOR DESULFONYLATION: PREPARATION OF β-SUBSTITUTED α,β-UNSATURATED KETONES AND ALDEHYDES
作者:Takashi Yoshida、Shojiro Saito
DOI:10.1246/cl.1982.165
日期:1982.2.5
The treatment of the tert-alkyl sulfones bearing carbonyl group at the β-position with 5 % hydrochloric acid in THF at 30–65 °C afforded β-substituted α,β-unsaturated ketones and aldehydes in excellent yields.