1,1'-Carbonyldiimidazole → Methyl [4-(5-imidazol-1-yl-8,8-dimethyl-5,6,7,8-tetrahydro-naphthalen-2-ylethynyl)-phenyl]-acetate

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A solution of methyl [4-(5-hydroxy-8,8-dimethyl-5,6,7,8-tetrahydro-naphthalen-2-ylethynyl)-phenyl]-acetate (Compound 135, 140.0 mg, 0.40 mmol) and carbonyldiimidazole (136.0 mg, 0.84 mmol) in 5 mL THF was heated to 65° C. for 48 hours. The solution was cooled to room temperature and concentrated under reduced pressure. The residue was dissolved in Et2O and washed with 5% aqueous NaOH, H2O, and saturated aqueous NaCl before being dried (Na2SO4) and concentrated under reduced pressure. Column chromatography (5% MeOH—CH2Cl2) afforded 50.0 mg (31%) of the title compound as a colorless solid.

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