Improved processes for the preparation of protected...

Details Improved processes for the preparation of protected... Improved processes for the preparation of protected...

C - Chemistry, Metallurgy

07

D

C07D 311/26 (2006.01)

Patent

CA 2611878

Improved processes for the preparation of tetra-O-benzyl protected -(+)- catechin, for the coupling of the tetra-O-benzyl protected -(+)-catechin or -(- )-epicatechin with a C-4 activated, tetra-O-benzyl protected -(-)-epicatechin, for the galloylation of the (-)-epicatechin-(4.beta.,8)-(+)-catechin or -(-)- epicatechin dimer to the dimer digallates, and for the deprotection (i.e., debenzylation) of the protected -(-)-epicatechin dimers and protected -(-)- epicatechin dimer digallates are disclosed.

L'invention concerne des procédés améliorés de préparation de -(+)-catéchine à protection tétra-O-benzyle permettant de coupler la -(+)-catéchine ou -(-)-épicatéchine à protection tétra-O-benzyle avec une -(-)-épicatéchine à protection tétra-O-benzyle activée C-4, pour la galloylation de l'(-)-épicatéchine-(4ß,8)-(+)-catéchine ou dimère d'-(-)-épicatéchine aux digallates de dimère, et pour la déprotection (c'est-à-dire la débenzylation) des dimères d'-(-)-épicatéchine protégés et des digallates de dimère d'-(-)-épicatéchine protégés.

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