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6-(2-Morpholine-4-ylethoxy)-1-oxo-3-phenyl-1H-indene-2-carboxylic acid ethyl ester (1.5 g, 3.68 mmol) obtained in Step 1 was dissolved in THF, and phenylmagnesium chloride (3.865 mL, 5.89 mmol) was added thereto, followed by stirring for 2 hrs at 0° C. The resulting mixture washed with saturated saline and extracted with ethyl acetate. The organic layer was separated, dried over anhydrous MgSO4, and concentrated under a reduced pressure. The resulting residue was purified by flash chromatography to obtain 788 mg of the titled compound (yield: 44%).

1. washThe resulting mixture washed with saturated saline
2. extractionextracted with ethyl acetate
3. customThe organic layer was separated
4. dry with materialdried over anhydrous MgSO4
5. concentrationconcentrated under a reduced pressure
6. customThe resulting residue was purified by flash chromatography