Synthesis and properties of a biotin-tagged NHC–gold complex
摘要:
The first synthesis of a biotin-tagged NHC-gold complex is described. The key step is the coupling of alkyne-substituted biotin derivative 4b with azido-imidazolium salt 8a by copper-catalyzed azide alkyne cycloaddition (CuAAC). Gold complex 2 catalyzes the cycloisomerization of alpha-hydroxyallenes to 2,5-dihydrofurans. (C) 2015 Elsevier Ltd. All rights reserved.
The invention relates to compounds of the general formula
in which R
1
, R
2
, R3, R
4
, R
2′
, R3′, R
4′
, R
5
, and X is —CHR— are as defined in the specification. The invention also provides pharmaceutically acceptable acid addition salts, optically pure enantiomers, racemates and diastereomeric mixtures of such compounds. The invention further provides methods for the treatment of Alzheimer's disease or common cancers.
The invention relates to compounds of the general formula (I), wherein R1-R5 and R2’-R4’ are as described in the claims and to pharmaceutically suitable acid additon salts, optical pure enantiomers, racemates or diastereomeric mixtures thereof for the treatment of Alzheimer’s disease or common cancers.