Thionyl Chloride → HCID 178440617, compound

Participants

Reaction Conditions

Reaction Steps

SOCl2 (1 mL) is added dropwise to a solution of cis-4-[(2R,6S)-10-hydroxy-6,11,11-trimethyl-1,2,5,6-tetrahydro-4H-2,6-methano-benzo[d]azocine-3-carbonyl]-cyclohexane carboxylic acid (100 mg) in tert-butanol (5 mL) cooled to −10° C. Then, the cooling bath is removed and the resulting solution is stirred at ambient temperature overnight before another portion of SOCl2 (1 mL) is added. After stirring for additional 12 h more SOCl2 (2 mL) is added and the solution is heated to 50° C. The solution is stirred at this temperature for 48 h before HCl in 1,4-dioxane (1 mL) is added. The resulting solution is stirred at reflux temperature overnight and then treated with concentrated H2SO4 (3 mL). After stirring at reflux temperature for additional 3 h, the solution is cooled to ambient temperature and concentrated under reduced pressure. The residue is treated with water and the precipitate is separated by filtration. The precipitate is taken up in ethyl acetate and washed with water and dried (MgSO4). After removing the solvent, the residue is purified by HPLC (water/MeCN/F3CCO2H).

Provenance & Evidence