corresponding unsymmetrical 1,2-diols in moderate to good yields. α-Hydroxy ketones were prepared by the lanthanum metal-assistedreaction of diaryl ketones with esters or nitriles, followed by hydrolysis with aq HCl. It is interesting to note that for the epoxides, the coupling reaction proceeded via the Meinwald rearrangement of epoxides to give the corresponding 1,2-diols.
Retropinacol/Cross-Pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
作者:Ulf Scheffler、Reinhard Stößer、Rainer Mahrwald
DOI:10.1002/adsc.201200358
日期:2012.10.8
A new concept to access unsymmetrical 1,2-diols with high yields is reported. This new methodology is based on a retropinacol/cross-pinacol coupling process. This transformation is characterized by its operational simplicity and very mild reaction conditions.
A One-Pot Cross-Pinacol Coupling/Rearrangement Procedure
作者:Ulf Scheffler、Rainer Mahrwald
DOI:10.1002/hlca.201200402
日期:2012.10
A new catalytic retro‐pinacol/cross‐pinacol reaction, followed by subsequent rearrangement or deoxygenation of the intermediately formed vicinal diols, is described. This operationally simple one‐pot protocol allows isolation of geminal α,α‐diphenyl ketones or 1,1‐diphenyl alkenes with high yields and selectivities.
Decarboxylative 1,2-rearrangement of cyclic carbonates promoted by Lewis acid
作者:Yoichi Dokai、Kodai Saito、Tohru Yamada
DOI:10.1039/d2cc03024a
日期:——
A Lewis acid-mediated decarboxylative 1,2-rearrangement reaction of cyclic carbonates was developed. The selectivity of the migration of cyclic carbonates was opposite to that of the corresponding 1,2-diols under the same reaction conditions.