Tetrahedron

L'oreal

Innoverda

Irène Erdelmeier

Karine Lucet-Levannier

Marc E Moutet

Sylvain Daunay

Marc Moutet

Jean-Claude Yadan

A method for synthesizing 4-hydroxy-3,5-diiodobenzyl alcohol. The synthesis method includes, in just one step, the synthesis of 4-hydroxy-3,5-diiodobenzyl alcohol from 4-hydroxybenzylalcohol, in an aqueous medium at an initial pH of at least 7, containing at least 2 equivalents of diiodide. The method is simple and makes it possible to achieve very good yields at a lower cost.

Method for synthesizing 3,5-diiodo-4-hydroxy benzyl alcohol

Methods for the synthesis of 2-thiohistidine or a derivative thereof of the formula (I), or of a physiologically acceptable salt, a tautomer, a stereoisomer or a mixture of stereoisomers in any proportions thereof, from a compound of the formula (II) or a physiologically acceptable salt, a tautomer, a stereoisomer or a mixture of stereoisomers in any proportions thereof, by cleavage reaction in the presence of a thiol at a temperature higher than or equal to 60&#xb0; C. The invention also relates to compounds of the formula (II) and a method for the synthesis thereof.

Method for the synthesis of 2-thiohistidine and the like

The present invention relates to a novel process for preparing 2-hydroxy-4-methylselenobutyric acid from 3-methylselenoproprion-aldehyde. The 2-hydroxy-4-methylselenobutyric acid is obtained alone or as a mixture with its sulphur-containing analogue. The invention also relates to the compositions, in particular nutritional compositions, comprising a mixture of 2-hydroxy-4-methylselenobutyric acid and 2-hydroxy-4-methylthiobutyric acid, and a physiologically acceptable medium, and to the use of this mixture as a dietary ingredient.

Process for preparing 2-hydroxy-4-methylselenobutyric acid, alone or as a mixture with its sulphur-containing analogue, and uses thereof in nutrition, in particular animal nutrition

The present invention relates to novel heterocyclic derivatives of 2-oxothiazolidine-4-carboxylic acid, to a process for synthesizing them and to compositions containing them. The invention also relates to the use of at least one heterocyclic derivative of 2-oxathiazolidine-4-carboxylic acid in a composition or for the manufacture of a composition, the said derivative or the said composition being intended to induce active photoprotection of the skin, advantageously to prepare the skin to receive sunlight and/or to protect the skin and other epidermal growths during or after exposure to UV. Another subject of the invention also relates to a cosmetic process for treating the skin by oral administration or topical administration to the skin of a cosmetic composition as defined above.

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Paris, France

Irène Erdelmeier