Abstract:
The invention relates to the production of oxo-vinyl-ionol and O-protected derivatives thereof of formula (I), wherein R stands for hydrogen or an OH protecting group, for example a group Si(Ra)3, by reacting a compound of general formula (II), wherein R has the meanings previously specified for formula (I), i.e. beta-vinyl-ionol (formula (II), R = hydrogen) or an O-protected derivative thereof (formula (II), R = OH protecting group), with an oxidant in the presence of at least one transition metal, wherein the oxidant comprises at least one compound containing oxygen, which compound is selected from among hydrogen peroxide and organic hydroperoxides.
Abstract:
The present invention relates to the preparation of oxovinylionol and its O-protected derivatives of the formula I (I) in which R is hydrogen or an OH protecting group, for example a group Si(Ra)3 by reacting a compound of the formula II (II) in which R have the meanings given above for formula I, i.e. ?-vinyl ionol (formula II, R = hydrogen) or an O-protected derivative thereof (formula II, R = OH protecting group) with an oxidant in the presence of at least one transition metal, where the oxidant comprises at least one oxygen-containing compound which is selected from among hydrogen peroxide and organic hydroperoxides. (No suitable figure)
Abstract:
The invention relates to an environmentally friendly, resource-conserving, and economical method for producing astaxanthin esters of formula 1, wherein astaxanthin of formula 2 is doubly esterified with fatty acid chlorides of general formula 3. For this purpose, compounds 2 and 3 are reacted in an organic solvent in the presence of a nitrogen-containing base of general formula 4. The invention further relates to the non-therapeutic use of diester 1, wherein R stands for a residue that is selected from the group consisting of C13-C19 alkyl, C13-C19 alkenyl, C13-C19 alkdienyl, and C13-C19 alktrienyl, in the nourishment of humans or animals, and to diester 1 produced according to the method, for therapeutic use as a medication and as an ingredient for a medical preparation.
Abstract:
Procedimiento para la preparación de oxo-vinil-ionol y sus derivados O-protegidos de la fórmula I **(Ver fórmula)** en la cual R representa hidrógeno o un grupo protector de OH, caracterizado porque se hace reaccionar β-vinilionol o un derivado O-protegido del mismo de la fórmula II, en la cual R tiene los significados antes mencionados, con un agente de oxidación en presencia de al menos un metal de transición, el cual se selecciona entre Cu, Co, Fe y Mn y sus mezclas y comprendiendo el agente de oxidación al menos un compuesto que contiene oxígeno, el cual se selecciona entre peróxido de hidrógeno e hidroperóxidos orgánicos.
Abstract:
The invention relates to an environmentally friendly, resource-conserving, and economical method for producing astaxanthin esters of formula 1, wherein astaxanthin of formula 2 is doubly esterified with fatty acid chlorides of general formula 3. For this purpose, compounds 2 and 3 are reacted in an organic solvent in the presence of a nitrogen-containing base of general formula 4. The invention further relates to the non-therapeutic use of diester 1, wherein R stands for a residue that is selected from the group consisting of C13-C19 alkyl, C13-C19 alkenyl, C13-C19 alkdienyl, and C13-C19 alktrienyl, in the nourishment of humans or animals, and to diester 1 produced according to the method, for therapeutic use as a medication and as an ingredient for a medical preparation.