[CH3:1][Li].[C:3]1([C:17]([OH:19])=O)[C:16]2[S:15][C:14]3[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=3)[S:8][C:7]=2[CH:6]=[CH:5][CH:4]=1.N#N.Cl>O1CCCC1.O>[C:3]1([C:17](=[O:19])[CH3:1])[C:16]2[S:15][C:14]3[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=3)[S:8][C:7]=2[CH:6]=[CH:5][CH:4]=1Methyl lithium (1.6M in ether, 57 ml, 90 mmol) was added drop wise to a stirred solution of thianthrene-1-carboxylic acid (11.71 g, 45 mmol) in dry tetrahydrofuran (200 ml) at −78° C. over 30 minutes under an inert atmosphere (N2). The reaction mixture was allowed to warm to room temperature and (very thick white suspension present) was left stirring for 4 hours. Water (10 ml) was then added carefully to the solution and the pH was adjusted to 1 (pH paper) with 2N HCl. The solvent was removed in vacuo and the yellow solid formed was filtered and dried overnight in a vacuum desiccators. The solid was then purified by column chromatography (ethyl acetate/hexane; 1:9) and was recrystalised from ethanol to give the desired product (6.58 g, 57%). 1HNMR (300 MHz, CDCl3): δH=2.65 (3H, s); 7.26 (3H, m); 7.47 (2H, m); 7.62 (2H, d). m/z (LC-MS, ESP) RT=4.95 min; (M++1)=259
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