Determination of absolute configuration of α-hydroxyphosphonates by 31P NMR spectroscopy of corresponding mosher esters
作者:Friedrich Hammerschmidt、Li Yong-Fu
DOI:10.1016/s0040-4020(01)81758-0
日期:1994.8
(R)-MTPA esters of alpha-hydroxyphosphonates 1a-h of known absolute configuration were prepared and their P-31 NMR spectra were recorded. The chemical shifts of the P-31 signals of the derivatized (S)-alcohols are consistently downfield relative to the signals of the corresponding (R)-alcohols. A variety of racemic and diastereomeric alpha-hydroxyphosphonates 1i-o and their (R)-MTPA esters were prepared. The P-31 chemical shift differences are large enough to securely assign absolute configurations to alpha-hydroxyphosphonates.
Hammerschmidt Friedrich, Li Yong-Fu, Tetrahedron, 50 (1994) N 34, S 10253-10264