作者:Jianguo An、Jeffrey M. Wilson、Yi-Zhong An、David F. Wiemer
DOI:10.1021/jo9518157
日期:1996.1.1
nonracemic diols and amino alcohols have been tested for their utility as chiral auxiliaries in vinyl phosphate/beta-keto phosphonate rearrangements. When (2R,4R)- or (2S,4S)-pentane-2,4-diol were employed, the diastereomeric beta-keto phosphonates obtained from three prochiral cyclohexanones gave separate resonances in their respective (31)P NMR spectra, allowing estimation of diastereomeric excess
已经测试了几种非外消旋二醇和氨基醇在磷酸乙烯基酯/β-酮基膦酸酯重排中作为手性助剂的用途。当使用(2R,4R)-或(2S,4S)-戊烷-2,4-二醇时,由三个前手性环己酮获得的非对映体β-酮膦酸酯在其各自的(31)P NMR光谱中给出独立的共振,从而可以进行估计通过直接集成可以计算非对映体过量(de)。β-酮膦酸酯的结晶烯醇形式是从一种酮(4-(1,1-(亚乙二氧基)乙基)-4-甲基环己酮,10)获得的,其可以通过X射线衍射分析确定其绝对立体化学。当使用LTMP诱导衍生自酮10和(2R,4R)-或(2S,4S)-戊烷-2,4-二醇的磷酸乙烯基酯的重排时,得的de为2.5:1。此外,