[CH3:1][C:2]1[O:6][C:5]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)=[N:4][C:3]=1[CH2:13][CH2:14][C:15]([NH2:17])=O.COC1C=CC(P2(=S)SP(=S)(C3C=CC(OC)=CC=3)[S:27]2)=CC=1.O1CCCC1>C(OCC)(=O)C>[CH3:1][C:2]1[O:6][C:5]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)=[N:4][C:3]=1[CH2:13][CH2:14][C:15](=[S:27])[NH2:17]A mixture of 3-(5-methyl-2-phenyl-4-oxazolyl)propanamide (10.44 g), 2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetan-2,4-disulfide (14.64 g) and tetrahydrofuran (300 mL) was stirred at room temperature for 2 hrs. To the reaction mixture was added ethyl acetate, and the mixture was washed successively with water and saturated brine, dried over anhydrous magnesium sulfate and concentrated. The obtained residue was subjected to silica gel column chromatography to give crystals (10.7 g, 96%) of 3-(5-methyl-2-phenyl-4-oxazolyl)propanethioamide from a fraction eluted with ethyl acetate-hexane (1:3, v/v). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 167-168° C.
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