tert-Butyl carbamate → HCID 67269196, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-(4-bromo-benzyl)-3-(4-chloro-phenyl)-4,5,7,8-tetrahydro-1H-1,2,6-triaza-azulene-6-carboxylic acid tert-butyl ester (Example 113; 0.04 mmol), tert-butyl carbamate (0.05 mmol), sodium phenoxide trihydrate (0.05 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.001 mmol), and tri-tert-butylphosphine (0.05 mmol) in anhydrous toluene (3 mL) was heated under N2 at 100° C. for 6 h, 70° C. for 15 h and 100° C. for 2.5 h. After cooling to RT, the reaction mixture was purified directly by preparative TLC (2:1 hexanes/EtOAc) to yield 0.008 g of 1-(4-tert-butoxycarbonylamino-benzyl)-3-(4-chloro-phenyl)-4,5,7,8-tetrahydro-1H-1,2,6-triaza-azulene-6-carboxylic acid tert-butyl ester, which was then diluted with DMF (1 mL) and treated with NaH (60%, 1.5 equiv.). After 15 min, methyl iodide (1.5 equiv.) was added. After 1 h, the reaction was quenched with H2O and the mixture was extracted with EtOAc (2×). The combined organic layers were dried over Na2SO4 and concentrated. The resulting semi-solid was then dissolved in CH2Cl2/MeOH (9:1, 1 mL) and treated with HCl (1 N in Et2O, 4 mL). The mixture was stirred at RT for 3 h, then was concentrated. The resulting oil was purified by preparative TLC (10% 2 M NH3 in MeOH/CH2Cl2) to yield 0.002 mg of the title compound as a white solid. MS (ESI): exact mass calculated for C21H23ClN4, 366.16. found, m/z 367.1 [M+H]+. 1H NMR (500 MHz, CD3OD): 7.39-7.32 (m, 4H), 6.84 (d, J=8.6 Hz, 1H), 6.48-6.45 (m, 2H), 5.12 (s, 2H), 2.84-2.81 (m, 4H), 2.79-2.77 (m, 2H), 2.69-2.66 (m, 2H), 2.63 (s, 3H).

Provenance & Evidence