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US 11,851,404 B2Granted
Intermediates for the vitamin A synthesis
AssigneeDsm IP Assets B.V.
InventorsRaphael Beumer, Werner Bonrath, Marc-André Mueller, Bettina Wüestenberg
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Abstract
Processes for synthesizing new compounds that may usefully be employed in organic synthesis, especially in the synthesis of vitamin A or β-carotene and derivatives thereof, e.g. canthaxanthin, astaxanthin or zeaxanthin are disclosed. The new compounds are especially useful as intermediates (building blocks) in the synthesis of vitamin A or β-carotene, preferably vitamin A.
Claims11
A process for producing a compound of formula (I),
- wherein the process comprises the sequential steps of:
- (i) subjecting a compound of formula (III):
- to Grignard reaction conditions to form a compound of formula (IV):
- (ii) acetylating the compound of formula (IV) to form a compound of formula (II):
- and thereafter
- (iii) subjecting the compound of formula (II) to rearrangement conditions in the presence of an organic solvent to obtain the compound of formula (I).
3 more elements
Dependencies are inferred from the claim text.