[Cl:1][C:2]1[S:3][C:4]([CH2:11][OH:12])=[C:5]([C:7]([F:10])([F:9])[F:8])[N:6]=1.Br[CH2:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16].CCCCCC.[OH-].[Na+]>CCCCCCCC[N+](CCCCCCCC)(CCCCCCCC)C.[Cl-].O>[C:18]([O:17][C:15](=[O:16])[CH2:14][O:12][CH2:11][C:4]1[S:3][C:2]([Cl:1])=[N:6][C:5]=1[C:7]([F:8])([F:9])[F:10])([CH3:21])([CH3:20])[CH3:19]
A mixture of 4.32 G (0.02 Mol) of the compound of Example 4, 0.1 g of Aliquat 336, 3.9 g of t-butyl bromoacetate, 50 ml of hexane, 10 g of sodium hydroxide and 24 ml of water was held at reflux for 1 hour. The reaction mixture was filtered. The hexane layer was separated, dried over MgSO4 and concentrated under reduced pressure. The residue (1.6 g) was chromatographed on silica gel using ether-petroleum ether (2:98 v/v) as eluant. The first fraction gave 1.1 g (16.5%) of t-butyl{[2-chloro-4-(trifluoromethyl)-5-thiazolyl]methoxy}acetate, as an oil, nD25 1.4607.
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