Trienediolates of hexadienoic acids in synthesis. Addition to unsaturated ketones. A convergent approach to the synthesis of retinoic acids
作者:Maria J. Aurell、Luisa Ceita、Ramon Mestres、Margarita Parra、Amparo Tortajada
DOI:10.1016/0040-4020(95)00114-n
日期:1995.3
The regioselectivity of the addition of the lithium trienediolates generated from hexa-2,4dienoic acids 1 and 2 or the dihydropyran-2ones 4 and 5 to unsaturated ketones 6 is studied. Equilibration conditions favour reaction of the trienediolates through their ω carbon, and the ketones according to 1,2- and 1,4-additions. β-Ionone 6a and the aryl-butenone 6b lead to the 1,2-ω-adducts 8, which undergo
Trienediolates of hexadienoic acids in synthesis. synthesis of retinoic and nor-retinoic acids.
作者:María J. Aurell、Ismael Carne、José E. Clar、Salvador Gil、Ramon Mestres、Margarita Parra、Amparo Tortajada
DOI:10.1016/s0040-4020(01)87193-3
日期:1993.7
Double deprotonation of either (E,E)-3-methyl-2,4-hexadienoic acid 2. or 4,6-dimethyldihydro-2-pyrone 3 generates apparently the same lithium trienediolate, which affords omega-hydroxy acids 9 on reaction with ketones 7. Hydroxy acids 9 arc easily dehydrated to octatrienoic acids 5. which are structurally related to retinoic acid. Similarly, sorbic acid 1 leads to nor-retinoic acid analogs 6.
Duperrier,A. et al., Bulletin de la Societe Chimique de France, 1975, p. 2307 - 2312