2-Naphthalenesulfonyl chloride → HCID 86598199, compound

Participants

Reaction Steps

A mixture of 4-(hexahydro-1H-1,4-diazepin-1-yl)-benzoic acid, ethyl ester hydrochloride (1:2) (0.01 mol) and 2-naphthalenesulfonyl chloride (0.011 mol) in DCM p.a. (150 ml) was stirred at room temperature. NaHCO3 (saturated aqueous solution, 50 ml) was added and the reaction mixture was stirred for 4 hours at room temperature. The layers were separated. The organic layer was dried, filtered and the solvent evaporated. The residue was triturated under 2-propanol, filtered off and dried, yielding 4.5 g (quantitative yield) of 4-[hexahydro-4-(2-naphthalenylsulfonyl)-1H-1,4-diazepin-1-yl]-benzoic acid, ethyl ester (interm. 1). b) A mixture of interm. 1 (0.0091 mol) in HCl 35% (10 ml) and 1,4-dioxane (30 ml) was stirred and refluxed for 24 hours, then cooled and the resulting precipitate was filtered off, washed with dioxane, and dried. A part (0.9 g) of the residue (3.9 g, 96%) was recrystallized from ethanol with a small amount of DMF, filtered off and dried, yielding 0.43 g of 4-[hexahydro-4-(2-naphthalenylsulfonyl)-1H-1,4-diazepin-1-yl]-benzoic acid (interm. 2). c) A mixture of interm. 2 (0.0067 mol), O-(phenylmethyl)-hydroxylamine, hydrochloride (2 equiv, 0.0134 mol), 4-methylmorpholine (4 equiv, 0.027 mol) and DMAP (0.5 g) in DCM p.a. (200 ml) was stirred at room temperature. DIC (2 equiv, 0.0134 mol) was added and the reaction mixture was stirred for 2 hours at room temperature. The solvent was evaporated. The residue was triturated under ethanol, filtered off and dried. The residue was purified over silica gel on a glass filter (eluent: DCM/MeOH 99/1). The desired fractions were collected and the solvent was evaporated. The residue was triturated under DCM (30 ml), filtered off and dried, yielding 1.9 g (55%) of 4-[hexahydro-4-(2-naphthalenylsulfonyl)-1H-1,4-diazepin-1-yl]-N-(phenylmethoxy)-benzamide (interm. 3).

Provenance & Evidence