A new Lewis acid‐catalyzed endo‐selective Prins bicyclization of γ,δ‐unsaturated aldehydes or ketones with a broad range of aldehydes to dioxabicyclo[2.2.2]octanes is disclosed. When using a chiral BINOL‐derived N‐triflylphosphoramide (NTPA) as catalyst and glyoxylate esters as substrates, the cross‐dimerization afford functionalized bicyclic acetals with excellent diastereo‐ and enantioselectivities
Alpha, beta-unsaturated ketones and their use as aroma chemicals
申请人:KURARAY CO., LTD.
公开号:EP0231896A1
公开(公告)日:1987-08-12
Described are α,β-unsaturated ketones of the general formula:
wherein R1, R2 and R3 may be the same or different and each represents a lower alkyl group. The ketones are useful as aroma chemicals.
slightly fruity and green facets. Although the dienone musks were predicted in silico to bind to the OR5AN1 receptor based on QM/MM calculations, they were found to be inactive in the in vitro assay. The latter results suggest that the OR5AN1 receptor is not the prime musk receptor but primarily responsible for the animalic character of certain macrocyclic ketones and nitro musks.