[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[CH:15]([C:16]3[C:17]([S:23]C)=[N:18][C:19](=[O:22])[NH:20][CH:21]=3)[C:10]3[N:11]=[C:12]([CH3:14])[S:13][C:9]=3[CH:8]=[CH:7][C:6]=2[CH:25]=1.CI.[CH3:28]C(C)([O-])C.[K+]>O1CCCC1.CN(C)C=O.C(OCC)(=O)C>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[CH:15]([C:16]3[C:17](=[S:23])[NH:18][C:19](=[O:22])[N:20]([CH3:28])[CH:21]=3)[C:10]3[N:11]=[C:12]([CH3:14])[S:13][C:9]=3[CH:8]=[CH:7][C:6]=2[CH:25]=1A solution of the product of example 39 step (i) (0.1 g) together with methyl iodide (0.040 ml) and a 1M solution of potassium tert-butoxide in tetrahydrofuran (0.52 ml) in N,N-dimethylformamide (10 ml) was heated at 80° C. for 2 h. The reaction mixture was cooled, diluted with ethyl acetate and washed with saturated aqueous ammonium chloride and brine. The organic phase was dried over magnesium sulphate, filtered and evaporated. The crude product was purified by chromatography eluting with 5% ethanol in ethyl acetate to give a yellow oil (86 mg). This material was dissolved in a saturated blue solution of sodium hydrosulphide in N,N-dimethylformamide (3 ml) and heated at 80° C. for 3 h. The reaction mixture was cooled, diluted with dichloromethane and washed with water. The organic phase was dried over magnesium sulphate, filtered and evaporated. The crude product was purified by chromatography eluting with 30% isohexane in ethyl acetate to give the title compound as a yellow solid.
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