| 摘要 |
New products of formula: <IMAGE> R'1 = in particular an optionally substituted thienyl, a furyl, a cycloalkyl, an optionally substituted phenyl, a naphthyl or a diphenyl naphthyl, R2 = a methyl or an ethyl, R''3 = in particular H, an alkyl, an alkenyl or an optionally substituted alkenyl, a hydroxyl, an acetyl or a hydroxyacetyl, R'4 = in particular H, OH, an alkyl, an alkenyl or an optionally substituted alkenyl, R5 = H or CH3 K = a blocked ketone group.
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