2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans, the preparatio

Details 2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans, the preparatio 2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans, the preparatio

1992-04-10

1994-04-05

Ivy, C. Warren

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30728

Patent

active

053006585

ABSTRACT:
2,5-bis(1,1-dialkoxy-2-propyl)-2,5-dihydrofurans of the formula I ##STR1## where R.sup.1 and R.sup.2 can be identical or different and can be alkyl of 1 to 4 carbons, the preparation thereof by reaction of 2,5-dialkoxy-2,5-dihydrofurans of the formula II ##STR2## In the presence of protic acids or Lewis acids with an alkyl propenyl ether of the formula III ##STR3## and the use thereof for preparing 2,7-dimethyl-2,4,6-octatrienedial and symmetric C.sub.40 -carotenoids such as .beta.-carotene, canthaxanthin and astaxanthin, are described.

REFERENCES:
patent: 4098827 (1978-07-01), Rosenberger
CA 58: 3308g, 1963.
Chemistry Letters, No. 7, Jul. 1989 1277-1280.
Journal of Organic Chemistry Bd. 47, No. 11 (1982), Rosenberger, "Canthaxanthin: A New Total Synthesis", pp. 2130-2134.
Synthesis, Dec. 1987, Stuttgart DE, pp. 1043-1054, T. Mukaiyama et al., "Cross-Coupling Reactions Based On Acetals."

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