Acetic Acid → Tert-butyl 12-(4-chlorophenyl)sulfonyl-4,5,10,12-tetrazatricyclo[6.3.1.02,6]dodeca-2(6),3-diene-10-carboxylate

Participants

Reaction Steps

To a solution of 9-(4-chloro-benzenesulfonyl)-6-hydroxymethylene-7-oxo-3,9-diaza-bicyclo[3.3.1]nonane-3-carboxylic acid tert-butyl ester (4.91 g, 11.1 mmol) in ethanol (20 mL) was added glacial acetic acid (0.5 mL) followed by hydrazine monohydrate (5.39 mL, 111.1 mmol). The reaction mixture was stirred at room temperature for 1 h after which saturated NaHCO3 (10 mL) was added. The resulting solution was extracted with EtOAc (3×20 mL), the organic extracts were combined, dried (Na2SO4), filtered, concentrated and purified by silica gel column chromatography (eluant hexane/EtOAc, 9/1 to 2/8) and preparative HPLC to give 12-(4-chloro-benzenesulfonyl)-4,5,10,12-tetraaza-tricyclo[6.3.1.02,6]dodeca-2(6),3-diene-10-carboxylic acid tert-butyl ester as a white solid. Retention time (min)=1.794, method [1], MS (ESI) 439.1 (M+H); 1H NMR (300 MHz, CDCl3) δ 7.60 (d, J=8.2 Hz, 2H), 7.40 (s, 1H), 7.32 (d, J=8.2 Hz, 2H), 5.39 (s, 1H), 4.31 (s, 1H), 4.15-4.00 (m, 1H), 3.90 (d, J=12.1 Hz, 1H), 3.39-3.10 (m, 2H), 2.75-2.60 (m, 2H), 1.20-1.07 (m, 9H).

Provenance & Evidence