1,4,6,10-Tetra-Double Bond Pentadec-Carbon Phosphonate, Preparation Method Thereof, And Preparation Method Of Lycopene Using The Same
申请人:Shen Runpu
公开号:US20120310002A1
公开(公告)日:2012-12-06
1,4,6,10-tetra-double bond pentadec-carbon phosphonate of formula (4), and preparation method thereof are provided. The preparation method comprises: reacting a pseudo ionone of formula (2) with sulfonium salt to prepare a epoxide of formula (9), and then reacting the epoxide of formula (9) with magnesium bromide to prepare a C-14 aldehyde of formula (3); condensing the C-14 aldehyde of formula (3) with tetra-alkyl methylene diphosphonate to obtain 1,4,6,10-tetra-double bond pentadec-carbon phosphonate of formula (4). Furthermore, the preparation method of lycopene via 1,4,6,10-tetra-double bond pentadec-carbon phosphonate of formula (4) is also provided. The present method has the advantages of short route, easily obtained raw materials, and low cost.
A novel route for the totalsynthesis of lycopene 1 is described. The synthesis is based on: (i) a condensation between 4,4-dimethoxy-3-methylbutanal 4 and methylenebisphosphonic acid tetraethyl ester 5, leading to the C6-phosphonate 6, followed by (ii) a modified Wittig–Horner reaction between 6 and 6-methyl-5-hepten-2-one 7 producing dimethoxy-3,5,9-triene 8, and (iii) another modified Wittig–Horner