Dialdehyde compound, preparation method thereof, and synthetic method of carotenoids using the same
申请人:Koo Sang Ho
公开号:US20090318732A1
公开(公告)日:2009-12-24
The novel C dialdehyde compound which can be efficiently utilized in the synthesis of carotenoid compounds based on the sulfone chemistry, the preparation method of the same, and the expeditious and practical synthetic processes for lycopene and β-carotene by the use of the above novel compound are disclosed. The syntheses of lycopene and β-carotene are characterized by the processes of the coupling reaction between two equivalents of geranyl sulfone or cyclic geranyl sulfone and the above C dialdehyde, the functional group transformation reactions of the diol in the resulting C 40 coupling products to X's (either halogens or ethers), and the double elimination reactions of the functional groups of the benzenesulfonyl and X to produce the fully conjugated polyene chain of the carotenoids.
Our lycopenesynthesis highlights the expeditious assembly of the carbon skeleton by the use of a readily available ten-carbon unit, geraniol, rather than the original natural five-carbon building block, isopentenyl pyrophosphate. Furthermore, four oxidation steps by the enzyme desaturases to produce the conjugated carbon-carbon double bonds of lycopene are merged into one-pot double elimination reactions