Diisopropylethylamine → tert-butyl 4-(3-chloro-4-(N-(2-hydroxyethyl)-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamido)benzoyl)piperazine-1-carboxylate

Participants

Reaction Steps

To a solution of 3-chloro-4-(N-(2-hydroxyethyl)-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamido)benzoic acid (0.100 g, 0.225 mmol) in 1 mL of THF was added as a whole HATU (0.094 g, 0.248 mmol) and DIEA (0.078 mL, 0.450 mmol). This reaction mixture was allowed to stir at room temperature for 30 minutes. Next, tert-butyl piperazine-1-carboxylate (0.12 g, 0.22 mmol) was added to the reaction mixture and stirred at room temperature for 1 hour. The reaction mixture was taken into a large volume of ethyl acetate, washed with water, then saline and dried (Na2SO4). The organic was then conc. in vacuo to a solid residue and purified by RP-HPLC to give tert-butyl 4-(3-chloro-4-(N-(2-hydroxyethyl)-4,5-dihydrobenzo[b]thieno[2,3-d]oxepine-2-carboxamido)benzoyl)piperazine-1-carboxylate.

Provenance & Evidence