Cl[CH2:2][C:3]([N:5]1[CH2:9][CH2:8][S:7][CH:6]1[CH2:10][O:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=1[O:18][CH3:19])=[O:4].[I-:20].[Na+]>CC(C)=O.O>[I:20][CH2:2][C:3]([N:5]1[CH2:9][CH2:8][S:7][CH:6]1[CH2:10][O:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=1[O:18][CH3:19])=[O:4]A solution of 3-α-chloroacetyl-2-(o-methoxyphenoxy)methyl-thiazolidine (6 g) in acetone (80 ml) is heated to reflux temperature in the presence of sodium iodide (5 g) for 3 hours and then poured in ice and water (400 ml). The precipitate is collected, dissolved in methylene dichloride and washed with water, 5% aqueous NaHCO3, 2N sodium thiosulphate, water and dried on Na2SO4. After the usual work-up, the residue is crystallized from acetone and isopropanol to give 5.92 g of 3-α-iodoacetyl-2-(o-methoxyphenoxy)methyl-thiazolidine m.p. 81°-83° C. Using this procedure sodium bromide, the 3-α-bromoacetyl-2-(o-methoxyphenoxy)methyl-thiazolidine is obtained, m.p. 82°-84° C.
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