[SH2:1].[CH2:2]([S:4][C:5](=N)[C:6]1[CH:11]=[CH:10][CH:9]=[C:8]([Cl:12])[C:7]=1[CH2:13][CH2:14][C:15]1[CH:20]=[C:19]([Br:21])[CH:18]=[CH:17][C:16]=1[O:22][CH3:23])[CH3:3].Cl.CCOCC>O1CCCC1.O>[CH2:2]([S:4][C:5](=[S:1])[C:6]1[CH:11]=[CH:10][CH:9]=[C:8]([Cl:12])[C:7]=1[CH2:13][CH2:14][C:15]1[CH:20]=[C:19]([Br:21])[CH:18]=[CH:17][C:16]=1[O:22][CH3:23])[CH3:3]As shown in Scheme 11, hydrogen sulfide gas (˜2 mL) was condensed into a cooled (−78° C.) solution of 2.8 grams (6.8 mmol) of 2-[2-(5-Bromo-2-methoxy-phenyl)-ethyl]-3-chloro-thiobenzimidic acid ethyl ester and 13.6 mL (13.6 mmol) of 1.0 M HCl/ether in 100 mL of tetrahydrofuran. The reaction was heated to 45° C. and stirred overnight in a sealed tube. The reaction mixture was diluted with water and extracted with methylene chloride once. The organic layer was washed with brine, dried (MgSO4), filtered and evaporated to give a crude orange oil. The oil was partially purified by chromatography through a short column of silica gel (eluting with 5:95 ethyl acetate/hexanes) which resulted in 1.8 g of an orange powder which was used directly in the next step.
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