Compounds of the general formula (II): ##STR1## in which N.sup.+ denotes an unsubstituted or substituted nitrogen-containing heterocyclyl ring bonded to the remainder of the molecule through a ring nitrogen atom and carrying a positive charge on said nitrogen atom; and the wavy line denotes either the E- or Z-isomeric position, are novel and are useful in the treatment of antibacterial infection in humans or animals.
Compounds of the general formula (II):
and pharmaceutically acceptable salts and in-vivo hydrolysable esters thereof,
in which
R denotes a hydrogen atom or an in vivo hydrolysable acyl group;
and the wavy line denotes either the E- or Z-isomeric position,
are novel compounds which exhibit β-lactamase inhibitory action and have antibacterial properties.
通式(II)化合物:
及其药学上可接受的盐类和体内可水解的酯类、
其中
R 表示氢原子或体内可水解酰基;
波浪线表示 E-或 Z-异构体位置、
是具有β-内酰胺酶抑制作用和抗菌特性的新型化合物。
Copper(II) SBA-15: A reusable catalyst for azide–alkyne cycloaddition
The azide-alkyne cycloaddition reaction was investigated under catalytic conditions involving a copper(II) loaded silica based mesoporous material. Cu(II) SBA-15 demonstrated a high catalytic effect in 1,4-triazoles synthesis in organic. No additives such as a base or a reductant are required. Quantitative yields were obtained and a mere filtration of the mesoporous material which retains copper(II) allows the recovery of the catalyst. In addition, up to 5 times recycling of the catalyst was achieved without loss of the activity affording 1,4-triazoles in a yield up to 98%. (C) 2014 Elsevier B.V. All rights reserved.