3543-74-6, Adding some certain compound to certain chemical reactions, such as: 3543-74-6, name is Ethyl 4-(5-(bis(2-hydroxyethyl)amino)-1-methyl-1H-benzo[d]imidazol-2-yl)butanoate, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 3543-74-6.
Example 12 Synthesis of 4-[5-[bis(2-chloroethyl)amino]-1-methyl-1H-benzimidazol-2-yl]butanoic acid (9, Bendamustine) To a solution of compound (7) (5.00 g, 14 mmol) in 40 ml methylene chloride thionyl chloride (4.26 g, 36 mmol) is added at 5 C. Afterwards, the solution is stirred at ambient temperature for 16 h. The solvent is removed by distillation under vacuum. To the thereby produced brown oil 45 ml of 37% hydrochloric acid and 30 ml water is added and heated to 95 C. for 30 min. Subsequently 0.9 g activated carbon is added and stirred for 10 minutes at 95 C. The product is filtered and concentrated under vacuum until a dried product is formed. Afterwards a crystallisation of compound (9) is carried out in 20 ml water. The product was filtered, washed with water and acetone and dried under vacuum for 2 h at 50 C. The yield of compound (9) amounts to 4.3 g (11 mmol) with a content >99% (73% of theory).
Chemical properties determine the actual use. Each compound has specific chemical properties and uses. We look forward to more synthetic routes in the future to expand reaction routes of 3543-74-6.
Reference:
Patent; Heyl Chemisch-pharmazeutische Fabrik GmbH & Co. KG; Frey, Michael; Walther, Dirk-Detlef; US2014/31560; (2014); A1;,
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