[CH3:1][O:2][C:3]1[CH:11]=[C:10]2[C:6]([CH2:7][CH2:8][CH:9]2[C:12]([OH:14])=O)=[CH:5][CH:4]=1.C(Cl)(=O)C([Cl:18])=O>C(Cl)Cl.CN(C=O)C>[CH3:1][O:2][C:3]1[CH:11]=[C:10]2[C:6]([CH2:7][CH2:8][CH:9]2[C:12]([Cl:18])=[O:14])=[CH:5][CH:4]=16-Methoxy-indane-1-carboxylic acid, 6.0 g (31 mmol), a compound of Formula 3, was dissolved in 50 ml of methylene chloride and reacted at ambient temperature with 4.0 ml (46 mmol) of oxalyl chloride in the presence of one drop of DMF. After 2 hours, the reaction mixture was brought to reflux and maintained for 15 minutes. It was then concentrated under vacuum and stirred for about 30 minutes, yielding 6-methoxy-indane-1-carboxylic acid chloride, which was sufficiently pure to be used for the next step.
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