[CH:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][C:2]=1[S:11]([N:14]=[C:15]=[O:16])(=[O:13])=[O:12].[Cl:17][C:18]1[CH:19]=[C:20]([NH:24][CH2:25][C:26](O)=[O:27])[CH:21]=[CH:22][CH:23]=1.C(N(CC)CC)C.ClCC(OCC)=O.Cl>O1CCCC1>[Cl:17][C:18]1[CH:19]=[C:20]([N:24]2[CH2:25][C:26](=[O:27])[N:14]([S:11]([C:2]3[CH:3]=[CH:4][C:5]4[C:10](=[CH:9][CH:8]=[CH:7][CH:6]=4)[CH:1]=3)(=[O:13])=[O:12])[C:15]2=[O:16])[CH:21]=[CH:22][CH:23]=1In accordance with the synthesis process (B), 1.0 g (81%, 3.49 mmol) of 2-naphthalenesulfonyl isocyanate was added to a solution of 647 mg (3.49 mmol) of N-3-chlorophenylaminoacetic acid in 50 ml of tetrahydrofuran at room temperature, and the resultant mixture was stirred for 16 hours. After completion of the reaction, the liquid reaction mixture was cooled to 0° C. and added with 881 mg (8.72 mmol) of triethylamine and 417 mg (3.84 mmol) of ethyl chloroacetate, followed by stirring at 0° C. for 1 hour. After completion of the reaction, the liquid reaction mixture was added with 20 ml of 1N hydrochloric acid and 30 ml of saturated saline and subjected to extraction with ethyl acetate. After washing the resultant extract with water, it was dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The thus-obtained crude product was purified by column chromatography on silica gel (hexane/ethyl acetate=3:1) and subjected to crystallization from hexane/ethyl acetate, thereby obtaining 324 mg (0.81 mmol) of the title compound as white crystals (yield: 23.2%).
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