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Abstract

The invention relates to a method for preparing a compound (I) or one of the salts thereof, and the uses of said method, R¹OOC—C(═X)—CHR²R³(I), wherein X is selected among O; N—R′, wherein R′ is H or a C1-C6 alkyl; and N—OR″ wherein R″ is H, or a C1-C6 alkyl or an alkylaryl; R¹ is H or a C1-C6 alkyl group; R² is H, a C1-C6 alkyl, or an alkylaryl; and R³ is CH₂SR⁴ or CH₂SeR⁴, where R⁴ is H or a C1-C6 alkyl from a compound (II), or one of the salts thereof, R¹OOC—C(═X)—CHR²R⁵ and R⁵ is H or COOR⁶, where R⁶ is H or a C1-C6 alkyl, said method being carried out in the presence of a compound (III) CH₂(Y)(Z). Wherein Y is H; OR⁷, where R⁷ is H, a C1-C6 alkyl or an acyl with formula CO—R⁴; SR⁴ or SeR⁴ where R⁴ matches the preceding definition; or 1 NR⁸R⁹, where R⁸ and R⁹, identical or different, each or together are a C1-C6 alkyl, or an alkylaryl; Z, identical or different to Y, is OR¹⁰ where R¹⁰ is H, a C1-C6 alkyl or CO—R⁴; a cyclic or acyclic N(COR⁴)(COR⁴) group; or NR¹¹R¹², where R¹¹ and R¹², identical or different, each or together are a C1-C6 alkyl or an alkylaryl; wherein Y and Z together are ═O; said method involving an intermediate product (IV) R¹OOC—C(═X)—CHR²—CH₂Z.

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First Claim