The invention provides novel cyclic dipeptide enantiomers comprising (R)-histidine or a derivative thereof as one of the amino acid residues. These compounds are useful a catalysts for production of (S) -α-cyanomethyl alcohols from aldehydes.
A cyanohydrination catalyst for the preparation of al- phahydroxynitriles from aldehydes and ketones comprises a solid cyclo-(D-phenylalanyl-D-histidine) or cyclo-(L-phenylalanyl-L-histidine)-dipeptide having a non-crystalline or amorphous component.
[EN] D-Camosine lipophilic derivatives are disclosed, characterized by higher bioavailability than L-camosine and intended for the pulmonary distribution where they can exert detoxifying activity on the cytotoxic carbonyl compounds induced by cigarette smoke. [FR] L'invention concerne des dérivés lipophiles de D-camosine qui se caractérisent par une biocompatibilité supérieure à celle de L-camosine et qui sont destinés à la diffusion pulmonaire où ils peuvent exercer une activité détoxifiante sur les composés carbonyles cytotoxiques induits par la fumée de cigarette.
Abderhalden; Geidel, Fermentforschung, 1931, vol. 12, p. 518,526