1-Bromo-4-isopropylbenzene → methyl(3aRS,4SR,7RS,7aRS)-2-benzyl-7-(4-isopropylphenyl)-7-hydroxy-4-phenyloctahydroisoindole-3a-carboxylate

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By carrying out the reaction as in Stage A of Example 1, but from 6 g of methyl (3aRS,4SR,7aRS)-2-benzyl-7-oxo-4-phenyloctahydroisoindole-3a-carboxylate in 60 cm3 of dry diethyl ether and from a solution of 4-isopropylphenyl magnesium bromide, prepared at the time of use from 4 g of 4-bromoisopropylbenzene and 0.52 g of magnesium turnings in 7 cm3 of dry diethyl ether, for eighteen hours at room temperature, 3.3 g (41%) of methyl (3aRS,4SR,7RS,7aRS)-2-benzyl-7-(4-isopropylphenyl)-7-hydroxy-4-phenyloctahydroisoindole-3a-carboxylate were obtained, after purification by flash chromatography on silica gel (230-400 mesh), elution being carried out with a gradient of mixtures of cyclohexane and of ethyl acetate (from 98/2 to 80/20 by volume), in the form of a yellow oil, the characteristic of which was as follows:

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