Preparation of astaxanthin, novel intermediates therefor and the

Details Preparation of astaxanthin, novel intermediates therefor and the Preparation of astaxanthin, novel intermediates therefor and the

1995-05-23

1997-04-29

Chan, Nicky

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568345, 568343, 568361, 568 11, C07C 4545

Patent

active

056250991

ABSTRACT:
Abstract of the Disclosure: Compounds of the formula I ##STR1## where R.sup.1 is H or C.sub.1 -C.sub.4 -alkyl, R.sup.2 is C.sub.1 -C.sub.4 -alkyl and R.sup.3 is an ether, silyl ether or acetal protective group which can be converted into a hydroxyl group by hydrolysis, in particular one of the radicals ##STR2## and a process for preparing these compounds by reacting an alkenyne of the formula II ##STR3## in an inert solvent in the presence of lithium amide with a cyclohexenone of the formula III ##STR4## and the use of the compounds of the formula I for preparing astaxanthin, are described.

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Widmer et al., Chem. Abst., 96: 85791p (1982).
Widmer et al., Helv. Chim. Acta 64, 2436-2446 (1981).
Rosenberger et al., J. Org. Chem., 47, 2130-2134 (1982).

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