Enantioselective preparation of 1-hydroxy neoisopulegol and 1-hydroxy neoisomenthol
作者:Abdellatif Fkyerat、Raffaele Tabacchi
DOI:10.1016/s0957-4166(97)00222-x
日期:1997.7
steps starting from geraniol. Their enantiomers (1S,3S,4S)-1-hydroxy isopulegol 5 and (1R,3S,4R)-1-hydroxy neoisopulegol 5 were prepared analogously. These compounds were converted to 1-hydroxy neoisomenthol 7, 8 and 1-hydroxy isomenthol 9, 10. Most of these compounds possess an organoleptic property.
A method has been developed for determining the absoluteconfigurations of acyclic tertiary alcoholsusing their 2NMA [methoxy-(2-naphthyl)acetic acid] esters. The 1H NMR spectra of (R)- and (S)-2NMA esters of model compounds were measured, and Δδ values (δR-ester − δS-ester) were calculated. The absoluteconfiguration for tertiary hydroxy group is determined based on the sign of Δδ values like that