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温度

0 °C

Trimethylacetyl chloride (4.23 g, 4.32 mL, 35.09 mmol) was added to a cold suspension (0° C.) of AlCl3 (11.7 g, 87.7 mmol) in dry CH2Cl2 (60 mL) under Ar. The yellow mixture was stirred at 0° C. for 15 minutes, and a solution of 9.00 g (17.54 mmol) of methyl 3-[N-(4-chlorobenzyl)-5-(quinolin-2-ylmethoxy)indol-2-yl]-2,2-dimethylpropanoate (prepared in Step A) in CH2Cl2 (40 mL) was added dropwise (over 10 minutes) at 0° C. The reaction mixture was stirred for 10 minutes and slowly poured onto an ice-cold and vigourously stirred mixture of 0.5M aqueous Na, K tartrate (500 mL) and EtOAc (400 mL). After 20 minutes, the aqueous layer was extracted with EtOAc (2×) and the combined organic extracts were washed with H2O (2×), with 1N aqueous NaOH (2×), with H2O (2×) and dried (MgSO4). Filtration and removal of solvents provided a yellow oily residue which was chromatographed on silica gel using EtOAc-hexane (1:4) to give the title compound.

1. stirringThe reaction mixture was stirred for 10 minutes
2. waitAfter 20 minutes
3. extractionthe aqueous layer was extracted with EtOAc (2×)
4. washthe combined organic extracts were washed with H2O (2×), with 1N aqueous NaOH (2×), with H2O (2×)
5. dry with materialdried (MgSO4)
6. filtrationFiltration and removal of solvents
7. customprovided a yellow oily residue which
8. customwas chromatographed on silica gel