464892-38-4Relevant articles and documents
A facile synthesis of (6S,1′S)-(+)-hernandulcin and (6S,1′R)-(+)-epihernandulcin
Kim, Jung Hun,Lim, Hyun Jin,Cheon, Seung Hoon
, p. 7501 - 7507 (2007/10/03)
A facile total synthesis of (+)-hernandulcin (1) was accomplished from (-)-isopulegol in 6 steps with 15% overall yield. Epoxidation of (-)-isopulegol with m-chloroperbenzoic acid followed by opening of the epoxide 3a with prenyl Grignard afforded the tertiary alcohol 4a with correct C-6 and C-1′ stereochemistry as a major product. Oxidation of the secondary alcohol in compound 4a to the ketone 5a was accomplished in high yield by using TPAP and N-methylmorpholine N-oxide. Conversion of the ketone 5a to α,β -unsaturated ketone via organoselenium intermediate gave (+)-hernandulcin (1). This method was also successfully applied to the synthesis of (+)-epihernandulcin (2).