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US 6,958,418 B2Granted
Process for preparing vanillylamine hydrochloride
AssigneeBoehringer Ingelheim Pharma GmbH & Co. KG
InventorsOliver Meyer, Ingo Heddesheimer
Life of this patent
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Abstract
Process for preparing vanillylamine or one of the salts thereof by reacting vanillin with hydroxylamine or the salts thereof in the presence of an organic salt, which may optionally be produced in situ, wherein the reaction is carried out in an inorganic or organic acid as diluent, and subsequently hydrogenating the resulting vanillyloxime with hydrogen in the presence of a suitable catalyst and an organic and/or inorganic acid.
Claims8
A process for preparing vanillylamine or a salt thereof comprising:
- a. reacting vanillin with hydroxylamine or the salt thereof in the presence of an organic salt;
- and
- b. hydrogenating the resulting vanillyloxime with hydrogen in the presence of a suitable catalyst and an organic acid or inorganic acid or a combination of an organic and inorganic acid;
- wherein step (a) is carried out in an inorganic or organic acid as diluent;
- and further wherein steps (a) and (b) are carried out in a single, reaction vessel.
2 more elements
Dependencies are inferred from the claim text.