Cl.[CH3:2][NH:3][O:4][CH3:5].C(N(CC)CC)C.[CH3:13][C:14]1([CH3:31])[CH2:23][CH2:22][C:21]([CH3:25])([CH3:24])[C:20]2[CH:19]=[C:18]([CH:26]=[CH:27][C:28](Cl)=[O:29])[CH:17]=[CH:16][C:15]1=2.O>C1COCC1>[CH3:5][O:4][N:3]([CH3:2])[C:28](=[O:29])/[CH:27]=[CH:26]/[C:18]1[CH:17]=[CH:16][C:15]2[C:14]([CH3:31])([CH3:13])[CH2:23][CH2:22][C:21]([CH3:25])([CH3:24])[C:20]=2[CH:19]=1
727 mg (7.45 mmol) of N,O-dimethylhydroxyl-amine hydrochloride, 10 ml of THF and 2.3 ml (16.4 mmol) of triethylamine are introduced into a three-necked flask under a stream of nitrogen. A solution of 2.06 g (7.45 mmol) of 3-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthyl)acryloyl chloride prepared in Example 1(c) in 20 ml of THF is added dropwise and the mixture is stirred at room temperature for six hours. The reaction medium is poured into water and extracted with ethyl acetate, and the organic phase is separated out after settling has taken place, dried over magnesium sulphate and evaporated. The residue obtained is purified by chromatography on a column of silica eluted with a mixture of heptane and ethyl acetate (80/20). After evaporating the solvents, 1 g (45%) of (E)-N-methoxy-N-methyl-3-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-2-naphthyl)acrylamide is collected in the form of an oil.
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