1075748-64-9Relevant academic research and scientific papers
Diastereospecific enolate addition and atom-efficient benzimidazole synthesis for the production of l/t calcium channel blocker act-280778
Funel, Jacques-Alexis,Brodbeck, Stephan,Guggisberg, Yves,Litjens, Remy,Seidel, Thomas,Struijk, Martin,Abele, Stefan
, p. 1674 - 1685 (2014)
A scalable access to 1 (ACT-280778), a potent L/T calcium channel blocker, has been developed. The synthesis, amenable to kilogram manufacturing, comprises 10 chemical steps from enantiomerically pure 5-phenylbicyclo[2.2.2]oct-5-en-2-one (3) and 1,4-dimethoxybenzene with a longest linear sequence of 7 steps. Key to the success of this fit-for-purpose approach are a robust and atom-efficient access to benzimidazole 4, the substrate-controlled diastereoselective enolate addition toward carboxylic acid 2 that was isolated by simple crystallization with high dr (>99:1), the convenient selective N-deacylation of intermediate 10, and the identification of a suitable solid form of 1 as the bis-maleate salt (1·2 C4H4O4). As an illustration of the robustness of this process, 14 kg of drug substance, suitable for human use, was produced with an overall yield of 38% over the longest linear sequence (7 steps).
SALTS OF ISOBUTYRIC ACID (1 R*, 2R*, 4R* ) -2- (2-{ [3- (4, 7-DIMETH0XY-1 H-BENZOIMIDAZOL-2-YL) -PROPYL] -METHYL-AMINO } -ETHYL) -5-PHENYL-BICYCLO [2.2.2] OCT-5- EN- 2 -YL
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Page/Page column 24, (2010/05/13)
The invention relates to crystalline salts of isobutyric acid (1R*,2R*,4R*)-2-(2-{[3-(4,7-dimethoxy-1H-benzoimidazol-2-yl)-propyl]-methyl-amino}-ethyl)-5-phenyl-bicyclo[2.2.2]oct-5-en-2-yl ester, processes for the preparation thereof, pharmaceutical compo
