作者:Adrian Häberli、Hanspeter Pfander
DOI:10.1002/(sici)1522-2675(19990505)82:5<696::aid-hlca696>3.0.co;2-x
日期:1999.5.5
The three apocarotenoids methyl (9Z)-8'-oxo-6,8'-diapocaroten-6-oate (2), methyl (9Z)-10'-oxo-6,10'diapocaroten-6-oate (4). and methyl (9Z)-14'-oxo-6,14'-diapocaroten-6-oate (5), recently isolated from annatto, were synthesized. The key step of all three syntheses was the Wittig reaction of the (Z)-terminus 6 with the phosphonium salts 15, 18, and 24, carrying the polyene chain. Bixin (1) was synthesized from 2 in a Horner-Emmons reaction.