Process for preparing an anticholinergic
First Claim
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1. A process for preparing tiotropium bromide of formula (I):
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said process comprising epoxidizing the tropenol ester of formula (VII);
to form the scopine ester of formula (IV);
which is then quaternized with methyl bromide to form tiotropium bromide of formula (I).
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Abstract
The invention relates to a new process for preparing (1α,2β,4β,5α,7β)-7-[(hydroxydi-2-thienylacetyl)oxy]-9,9-dimethyl-3-oxa-9-azoniatricyclo[3.3.1.02,4] nonane-bromide.
88 Citations
15 Claims
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1. A process for preparing tiotropium bromide of formula (I):
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said process comprising epoxidizing the tropenol ester of formula (VII);
to form the scopine ester of formula (IV);
which is then quaternized with methyl bromide to form tiotropium bromide of formula (I). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
is obtained by reacting tropenol of formula (V), optionally in the form of an acid addition salt thereof, with an ester of formula (VI) wherein R is a group which is selected from among hydroxy, methoxy, ethoxy, O— - N-succinimide, O—
N-phthalimide, phenyloxy, nitrophenyloxy, fluorophenyloxy, pentafluorophenyloxy, vinyloxy, —
S-methyl, —
S-ethyl and —
S-phenyl.
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6. A process according to claim 5, wherein the tropenol (V) is used in the form of an acid addition salt thereof which is selected from among the hydrochloride, hydrobromide, hydrogen phosphate, hydrogen sulphate, tetrafluoroborate and hexafluorophosphate salts.
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7. A process according to claim 5, wherein the reaction of (V) with (VI) to form (VII) is carried out in a suitable organic solvent.
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8. A process according to claim 5, wherein the reaction of (V) with (VI) to form (VII) is carried out in an organic solvent selected from among toluene, benzene, n-butylacetate, dichloromethane, THF, dioxane, dimethylacetamide, DMF and N-methylpyrrolidinone.
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9. A process according to claim 5, wherein the reaction of (V) with (VI) to form (VII) is carried out in the presence of an organic or inorganic base.
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10. A process according to claim 5, wherein the reaction of (V) with (VI) to form (VII) is carried out in the presence of a base selected from among the organic amines.
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11. A process according to claim 5, wherein the reaction of (V) with (VI) to form (VII) is carried out in the presence of diisopropylethylamine, triethylamine, DBU or pyridine.
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12. A process according to claim 5, wherein the reaction of (V) with (VI) to form (VII) is carried out in the presence an inorganic base.
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13. A process according to claim 5, wherein the reaction of (V) with (VI) to form (VII) is carried out in the presence of an alkali metal or alkaline earth metal carbonate, alkoxide or hydride of lithium, sodium, potassium or calcium.
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14. A process according to claim 5, wherein if R denotes hydroxy in the compound of formula (VI), the reaction of (V) with (VI) to form (VII) is carried out in the presence of coupling reagents.
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15. A process according to claim 14, wherein the coupling reagents are selected from among carbonyldiimidazole, carbonyldi-1,2,4-triazole, dicyclohexylcarbodiimide and ethyl-dimethylaminopropylcarbodiimide.
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Specification