Sodium Hydroxide → (rac.)-(1R*,5S*)-7-{6-[2-(2,6-Dichloro-4-methyl-phenoxy)ethoxy]-pyridin-3-yl}-3,9-diaza-bicyclo[3.3.1]non-6-ene-3,6,9-tricarboxylic acid 3-tert-butyl ester 9-(2,2,2-trichloro-1,1-dimethyl-ethyl) ester

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Reaction Conditions

Reaction Steps

Compound C5 (1.02 g, 1.3 mmol) was dissolved in EtOH (14 mL), and aq. 1M NaOH (6 mL) was added. The mixture was heated to 80° C., and stirred at this temperature for 3 h. The mixture was allowed to cool to rt, and the solvents were partially removed under reduced pressure. The residue was mixed with EtOAc, and this mixture was acidified with aq. 1M HCl. The phases were partitioned, and the aq. layer was extracted with EtOAc (2×). The combined org. extracts were dried over MgSO4, filtered, and the solvents were removed under reduced pressure. Drying under high vacuum yielded the crude title compound mixed with (rac.)-(1R*,5S*)-7-{6-[2-(2,6-dichloro-4-methyl-phenoxy)-ethoxy]-pyridin-3-yl}-3,9-diaza-bicyclo[3.3.1]non-7-ene-3,6,9-tricarboxylic acid 3-tert-butyl ester 9-(2,2,2-trichloro-1,1-dimethyl-ethyl) ester (864 mg, 87%), which was used further without purification. LC-MS: tR=1.15 min; ES+: 768.23.

Provenance & Evidence