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US 4,374,775 AGranted
Process for preparing vitamin K
AssigneeHoffmann-La Roche Inc.
InventorKarl H. Dotz
Life of this patent
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Abstract
A process for preparing vitamins of the vitamin K.sub.1 and K.sub.2 series in their E-isomeric form through the reaction of a phenylcarbene metal complex with an enyne and intermediates in this synthesis.
Claims3
The process of producing a compound of the formula ##STR13## wherein R.sup.2 is dimethylallyl, geranyl, farnesyl or an analogous isoprenoid terpenyl residue or the phytyl residue comprising oxidizing a compound of the formula:
- ##STR14## wherein R.sup.1 is lower alkyl, acyl or benzyl and R.sup.2 is as above with an oxidizing agent.
Dependencies are inferred from the claim text.