Trifluoroacetic acid → Methyl 6-{[{2-[[3-(aminosulfonyl)propyl]-(methyl)amino]ethyl}(methyl)amino]methyl}-13-cyclohexyl-5-methyl-6,7-dihydro-5H-indolo[1,2-d][1,4]benzodiazepine-10-carboxylate

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Reaction Steps

Methyl 13-cyclohexyl-5-methyl-6-(2,5,13,13-tetramethyl-9,9-dioxido-11-oxo-12-oxa-9-thia-2,5,10-triazatetradec-1-yl)-6,7-dihydro-5H-indolo[1,2-d][1,4]benzodiazepine-10-carboxylate was dissolved in DCM (0.05M) and TFA was added. The mixture was left standing at RT. After 1 h all volatiles were evaporated in vacuo. The residual material was coevaporated with toluene. Methyl 6-{[{2-[[3-(aminosulfonyl)propyl]-(methyl)amino]ethyl}(methyl)amino]methyl}-13-cyclohexyl-5-methyl-6,7-dihydro-5H-indolo[1,2-d][1,4]benzodiazepine-10-carboxylate was obtained as a reddish sticky solid. The material was dissolved in MeOH/THF (0.05 M) and 1M aqueous KOH solution (4 eq.) was added. The mixture was stirred at RT overnight and then warmed for 5 h to 70° C. After cooling to RT the solution was diluted with water and adjusted with 1M aqueous HCl to pH 6. The resulting suspension was extracted with EtOAc. The combined organic phases were washed with brine and dried over Na2SO4. All volatiles were evaporated in vacuo. The residual material was used without further purification in the next reaction (95%). (ES+) m/z 611 (M+H)+.

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