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0 °C

DMAP (122 mg, 1.0 mmol) and EDAC (249 mg, 1.3 mmol) were added as solids to a DMF solution of 1-phenylindole-2-carboxylic acid (237 mg, 1.0 mmol in 2 mL DMF), and the resultant reaction mixture was stirred for 10 minutes under a nitrogen atmosphere at 0° C. A methylene chloride solution of N-(valinyl)-3-amino-4-hydroxy-5-fluoropentanoic acid, t-butyl ester (306 mg, 1.0 mmol in 2 mL of methylene chloride) was added to the reaction mixture and the mixture was stirred for 1 hour under a nitrogen atmosphere at 0° C. and 4 hours at room temperature. The yellow reaction mixture was partitioned between ethyl acetate and 5% KHSO4 solution and the aqueous solution was back-extracted with ethyl acetate. The combined ethyl acetate solutions were washed with 5% KHSO4 solution, saturated sodium bicarbonate solution (2×) and brine, dried over sodium sulfate, and concentrated to give a colorless film (0.827 g). The film was subjected to flash chromatography on silica gel with ethyl acetate/hexanes (1:2) to yield the title product as a white foam (400 mg, 78%). TLC: (ethyl acetate/hexanes 1:1): Rf =0.27.

1. customthe resultant reaction mixture
2. stirringthe mixture was stirred for 1 hour under a nitrogen atmosphere at 0° C. and 4 hours at room temperature
3. customThe yellow reaction mixture was partitioned between ethyl acetate and 5% KHSO4 solution
4. extractionthe aqueous solution was back-extracted with ethyl acetate
5. washThe combined ethyl acetate solutions were washed with 5% KHSO4 solution, saturated sodium bicarbonate solution (2×) and brine
6. dry with materialdried over sodium sulfate
7. concentrationconcentrated
8. customto give a colorless film (0.827 g)