Carboxylates react rapidly and smoothly with 3-unsubstitutedisoxazoliumsalts under very mild conditions to yield enol esters. In this paper we report the application of this reaction as the carboxyl-activating step in a simple and practical synthesis of peptides. The utility of the specific peptide forming reagent, N-ethyl-5-phenylisoxazolium-3′-sulfonate, is described in some detail.
[EN] ENHANCERS SUCH AS N-HYDROXYACETANILIDE<br/>[FR] ACTIVATEURS TELS QUE LE N-HYDROXYACETANILIDE
申请人:NOVO NORDISK A/S
公开号:WO1999057360A1
公开(公告)日:1999-11-11
(EN) The present invention provides a method for bleaching a dye in solution comprising contacting, in an aqueous solution, the dye with a laccase and an enhancing agent of the formula -NOH-CO-, in particular N-Hydroxyacetanilide.(FR) La présente invention concerne un procédé de blanchiment d'un colorant en solution comprenant la mise en contact, dans une solution aqueuse, du colorant avec une laccase et un agent activateur de formule -NOH-CO-, en particulier de N-hydroxyacetanilide.