[CH:1]([C:4]1[CH:9]=[CH:8][C:7]([SH:10])=[CH:6][CH:5]=1)([CH3:3])[CH3:2].Cl[CH2:12][C:13](=O)[CH3:14].C([O-])([O-])=O.[K+].[K+]>CC(C)=O>[CH:1]([C:4]1[CH:5]=[CH:6][C:7]2[S:10][CH:12]=[C:13]([CH3:14])[C:8]=2[CH:9]=1)([CH3:3])[CH3:2]A mixture of 4-isopropyl-thiophenol (5.0 g, 32.8 mmol), chloroacetone (7.0 mL, 88 mmol) and K2CO3 (6.4 g, 46.3 mmol) in acetone (100 mL) was refluxed over night. More K2CO3 (2 g, 14.5 mmol) and chloroacetone (3.5 mL, 43 mmol) were added and the reaction mixture was heated for another 5 h. The reaction mixture was filtered and the solvent was evaporated. The crude product was mixed with polyphosphoric acid (15 g) and chlorobenzene (100 mL) and the reaction mixture was heated at reflux for 5 h. (Plé et al., (1988) J. Heterocyclic Chem. 25, 1271-1272). The reaction mixture was diluted with CH2Cl2 and washed with water. The combined organic phases were dried and the solvent was evaporated. The crude product was purified on silica using heptane as eluent, giving 4.2 g of the title compound as a colourless oil (67% over two steps). 1H NMR (400 MHz, CDCl3) δ ppm 1.37 (d, 6 H) 2.47 (d, 3 H) 3.02-3.16 (m, 1 H) 7.08 (s, 1 H) 7.27-7.30 (m, 1 H) 7.58 (d, 1 H) 7.80 (d, 1 H).
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