1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 14-cyclohexyl-6[2-(dimethylamino)ethyl]-N-(morpholin-4-ylsulfonyl)-5,6,7,8-tetrahydroindolo[2,1-a][2,5]benzodiazocine-11-carboxamide

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Reaction Steps

To 11-carboxy-14-cyclohexyl-6-[2-(dimethylammonio)ethyl]-5,6,7,8-tetrahydroindolo-[2,1-a][2,5]benzodiazocin-6-ium dichloride (1 eq) (prepared from the product described in Example 20, Step 5, by iterative freeze drying in the presence of aqueous HCl) in DCM (0.06 M) was added morpholine-4-sulfonamide (1.5 eq), EDCI (1.5 eq) and DMAP (1.5 eq). The solution was stirred at RT overnight. The solvent was evaporated in vacuo and the crude was purified by automated RP-MS-HPLC (stationary phase: column Waters SYMMETRY prep. C18, 7 μm, 19×300 mm. Mobile phase: MeCN/H2O buffered with 0.1 TFA). Fractions containing the pure compound were combined and freeze dried to afford the title compound as a white powder (31%).

Provenance & Evidence