Design and synthesis of new vancomycin derivatives
摘要:
A set of vancomycin derivatives with lipid chain attached via a glyceric acid linker was designed and synthesized. A concise synthesis towards these derivatives was developed and the IC(50)s of these new lipoglycopeptides were tested. Some of them showed very potent activity against both vancomycin sensitive and resistant strains. (C) 2014 Elsevier Ltd. All rights reserved.
Design and synthesis of new vancomycin derivatives
摘要:
A set of vancomycin derivatives with lipid chain attached via a glyceric acid linker was designed and synthesized. A concise synthesis towards these derivatives was developed and the IC(50)s of these new lipoglycopeptides were tested. Some of them showed very potent activity against both vancomycin sensitive and resistant strains. (C) 2014 Elsevier Ltd. All rights reserved.
Transition-metal-catalyzed reaction of diazocompounds, efficient synthesis of functionalized ethers by carbene insertion into the hydroxylic bond of alcohols
An Efficient catalytic synthesis of unsaturated ethers by carbeneinsertion (with diazoesters as carbene precursors) into the OH bond of unsaturated alcohols is reported. The regioselectivity for the OH insertion is high. However, depending on the catalyst counter-ions and the diazoester alkoxy group, addition to the unsaturated centre can be promoted to some extent, yielding then cyclopropyl and cyclopropenyl
Provided is a 5-(m-cyanobenzylamino)pyrazole derivative represented by the following formula:
wherein:
R1 represents a C1-6 alkyl group, a C3-7 cycloalkyl group or a phenyl group;
R2 represents a hydrogen atom or a C1-6 alkyl group;
R3 represents a C1-6 alkyl, etc.,
R4 represents a hydrogen atom, a halogen atom, a C1-6 alkyl group, etc.,
Y represents a C1-6 alkyl group, etc.; and
n is an integer of 0 to 4;
or a salt thereof.