[C:1]([C:3]1([C:14]2[C:19]3[N:20]=[C:21]([CH:23]([CH3:25])[CH3:24])[O:22][C:18]=3[C:17]([O:26][CH3:27])=[CH:16][CH:15]=2)[CH2:8][CH:7](C(OC)=O)[C:6](=[O:13])[CH2:5][CH2:4]1)#[N:2].[Na+].[Cl-].O>CS(C)=O>[C:1]([C:3]1([C:14]2[C:19]3[N:20]=[C:21]([CH:23]([CH3:25])[CH3:24])[O:22][C:18]=3[C:17]([O:26][CH3:27])=[CH:16][CH:15]=2)[CH2:8][CH2:7][C:6](=[O:13])[CH2:5][CH2:4]1)#[N:2]0.69 g (1.86 mmol) of methyl 5-cyano-5-(2-isopropyl-7-methoxybenzoxazol-4-yl)-2-oxocyclohexanecarboxylate (starting compound A8) is dissolved in 16 ml of DMSO, a solution of 0.73 g of NaCl in 2 ml of dist. water is added and the mixture is stirred at 140° C. for 8.5 h. After cooling the reaction mixture, it is diluted with 80 ml of dist. water and extracted with ethyl acetate, and the organic phase is separated off, dried over magnesium sulfate and concentrated to dryness in vacuo. After chromatography, the title compound (0.45 g) is obtained as a colorless solid. TLC, silica gel (glass plates), petroleum ether/ethyl acetate (7:3), Rf=0.56, m.p. 118° C.
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