[C:1](Cl)(=O)[C:2]([Cl:4])=[O:3].C1(C(O)=O)[C:9]2([CH2:14][CH2:13][O:12][CH2:11][CH2:10]2)[CH2:8]1>ClCCl.CN(C)C=O>[CH:1]1([C:2]([Cl:4])=[O:3])[C:9]2([CH2:14][CH2:13][O:12][CH2:11][CH2:10]2)[CH2:8]160.0 ml of oxalyl chloride are added to a solution of 98.73 g of 6-oxaspiro[2.5]-octane-1-carboxylic acid in 500 ml of dichloromethane at 0° C. One drop of N,N-dimethylformamide is added, and the reaction solution is stirred at room temperature for 1 hour. The reaction solution is then evaporated, and the crude product is employed directly for the next stage.
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