new class of antibacterial agents. We have determined the crystal structure of the Haemophilusinfluenzae LeuB in complex with the cofactor NAD+ and the inhibitor O-IbOHA, at 2.1 Å resolution; moreover, we have investigated the inhibitor mechanism of action by analyzing the enzyme kinetics. The structure of H. influenzae LeuB in complex with the intermediate analog inhibitor displays a fully closed conformation
Alkynyl oxime ether underwent a gold-catalyzed domino reaction involving cyclization and subsequent Claisen-type rearrangement to afford trisubstitutedisoxazoles in a direct, efficient, and regioselective manner. The products were successfully applied to the synthesis of unusual heterocycles as an illustration of the potential utility of the reaction.