777916-02-6Relevant academic research and scientific papers
Stereoselective and convergent syntheses of retinoic acid and its ester derivatives by the sulfone olefination reaction
Jeon, Hye-Sun,Yeo, Jung Eun,Jeong, Young Cheol,Koo, Sangho
, p. 2813 - 2820 (2007/10/03)
An extensive study on the stereoselective and convergent syntheses of retinoic acid and its ester derivatives utilizing the Julia sulfone olefination reaction has been reported. Various C5 units of the acid 4a, the esters 4b-e from the chemically and biologically important alcohols, and the furanone 6 have been prepared and coupled with the C15 allylic sulfone 3 to give the C20 compounds 10 and 11, which provided all-(E)-retinoic acid (1a), its ester derivatives 1b-e, and the furanone analogue 12b in a highly stereoselective manner after dehydrosulfonation reaction. The Julia olefination reaction of the C5 diester 13 and the C15 allylic sulfone 3 produced the known C20 diacid 15 which underwent stereoselective mono-decarboxylation to provide either 13-(Z)-retinoic acid (2) or all-(E)-retinoic acid (1) depending on the reagent used.
Preparation of the conjugated polyene chains with the 1,4-dimethyl substitution
Jeon, Hye-Sun,Koo, Sangho
, p. 7023 - 7026 (2007/10/03)
Allylic sulfones undergo the conjugate addition to diethyl chloroisopropylidenemalonate, followed by intramolecular cyclopropanation. DBU-promoted ring opening and subsequent desulfonation reactions of the resulting adduct produce the conjugated polyene chains with the 1,4-dimethyl substitution.
