Synthesis of (R)- or (S)-diphenylphosphinoyl hydroxy aldehydes and 1,2-diols using Mukaiyama's bicyclic aminal methodology and Sharpless asymmetric dihydroxylation
An efficient protocol for a sharpless style racemic dihydroxylation
作者:Jason Eames、Helen J. Mitchell、Adam Nelson、Peter O'Brien、Stuart Warren、Paul Wyatt
DOI:10.1016/0040-4039(95)00054-g
日期:1995.3
Dihydroxylation with solid OsCl3 to provide the catalytic oxidant, K3Fe(CN)(6) as stoichiometric oxidant, quinuclidine as the accelerating ligand with added K2CO3 and methanesulfonamide in a two-phase system (water and t-butanol) gives excellent yields of racemic syn diols from various alkenes (stilbenes, sulfides and phosphine oxides).
Eames, Jason; Mitchell, Helen J.; Nelson, Adam, Journal of the Chemical Society. Perkin transactions I, 1999, # 8, p. 1095 - 1104
作者:Eames, Jason、Mitchell, Helen J.、Nelson, Adam、O'Brien, Peter、Warren, Stuart、Wyatt, Paul
DOI:——
日期:——
Synthesis of (R)- or (S)-diphenylphosphinoyl hydroxy aldehydes and 1,2-diols using Mukaiyama's bicyclic aminal methodology and Sharpless asymmetric dihydroxylation
作者:Peter O'Brien、Stuart Warren
DOI:10.1039/p19960002129
日期:——
Two different approaches to diphenylphosphinoyl hydroxy aldehydes and 1,2-diols are compared. A lengthy chiral auxiliary approach using proline-derived aminals enables hydroxy aldehydes and 1,2-diols of known absolute stereochemistry and high enantiomeric excess to be synthesised. In contrast, a much shorter asymmetric dihydroxylation route generates 1,2-diols with lower enantiomeric excesses and unexpected (in view of Sharpless's mnemonic) absolute stereochemistry. The dihydroxylation results are thus of both mechanistic and synthetic value.