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.
比较了二苯基膦酰羟基醛和 1,2-二醇的两种不同方法。使用脯氨酸衍生的缩醛胺的冗长的手性辅助方法能够合成已知绝对立体化学和高对映体过量的羟基醛和1,2-二醇。相比之下,更短的不对称二羟基化路线产生的1,2-二醇具有较低的对映体过量和意想不到的(鉴于夏普莱斯的助记符)绝对立体化学。因此,二羟基化结果具有机械价值和合成价值。