Nitrogen → HCID 58204769, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(tert-Butoxycarbonyl)pyrrolidine (1.02 mL, 0.00584 mol) and N,N,N′,N′-Tetramethylethylenediamine (0.881 mL, 0.00584 mol) in anhydrous 2-Methoxy-2-methylpropane (12 mL) at −78° C. was added sec-Butyllithium (0.00584 mol, 1.4M in cyclohexane, 4.17 mL). The reaction was stirred for 3 hours at −78° C. A solution of Zinc dichloride (0.00350 mol, 0.5 M in THF, 7.0 mL) was added dropwise with rapid stirring and was stirred at −78° C. for 30 minutes. The reaction was then warmed to room temperature and stirred an additional 30 mintues. To a N2-filled flask containing 8-Bromo-2-(2-isopropyl-5-methyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene (0.900 g, 0.00232 mol), Palladium Acetate (0.0260 g, 0.116 mmol) and Tri-t-butylphosphonium tetrafluoroborate (0.0420 g, 0.000145 mol) was added the zinc chloride pyrrolidine solution (1.25 equiv., 0.243M, 11.9 mL). The reaction was heated to 90° C. overnight. An incomplete conversion to product was observed by LC/MS. The mixture was diluted with dichloromethane and filtered through celite. Saturated NH4Cl was added and the mixture was extracted 3 times with dichloromethane. The organic layers were combined, dried with Na2SO4 and concentrated. The crude was redissolved in Methylene chloride (4.5 mL). Trifluoroacetic Acid (5.5 mL) was added and the reaction was stirred at room temperature for 30 minutes, then concentrated. The crude was purified by reverse-phase HPLC and the enantiomers were separated by chiral SFC to obtain 10 mg of each enantiomer of 2-(2-Isopropyl-5-methyl-2H-[1,2,4]triazol-3-yl)-8-pyrrolidin-2-yl-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene as a white solid. MS(ESI+) 379.2

Provenance & Evidence