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ChemicalBook CAS DataBase List desmethylazelastine
47491-38-3

desmethylazelastine synthesis

7synthesis methods
-

Yield:-

Steps:

Multi-step reaction with 4 steps
1.1: sodium acetate / 1-methyl-pyrrolidin-2-one / 48 h / 200 °C
2.1: hydrazine / ethanol / 15 h / 85 °C
2.2: 2 h / 2 °C
3.1: di-isopropyl azodicarboxylate; triphenylphosphine / tetrahydrofuran / 3.58 h / -20 - 20 °C
4.1: hydrogenchloride / 1,4-dioxane / 1.5 h / 20 °C

References:

GLAXO GROUP LIMITED WO2007/122156, 2007, A1

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