Synthesis of N-[3-(dimethylamino)-2-(substituted thio)-2-propenylidene]-N-methylmethanaminium salts via 2-(alkylthio)- and 2-(arylthio)-3-(dimethylamino)acroleins
Highly Efficient O-Glycosylations with p-Tolyl Thioribosides and p-TolSOTf
摘要:
GraphicsA wide variety of p-tolyl thioriboside donors are examined for O-ribosylations of primary and secondary alcohols. p-Tolylsulfenyl trifluoromethanesulfonate (p-TolSOTf) is very effective in promoting O-ribosylations with p-tolyl thioriboside; all reactions are completed within 1-15 min to provide the desired products in good yield with reliable alpha/beta selectivity. A wide range of functional groups are tolerated under these conditions. The described O-ribosylation conditions are very useful for the generation of ribosaminouridine library molecules in solution or on polymer support.
Oxidative cross-coupling of two thiols is the most direct tool for the synthesis of unsymmetrical disulfides and highly desirable across academia and industry. However, the inevitable formation of significant amounts of the corresponding symmetrical by-products is a major issue. We herein present a method toward the synthesis of unsymmetrical disulfides in which the homo-coupling of the thiols is effectively
Design, synthesis and biological evaluation of sulfenimine cephalosporin sulfoxides as β-lactamase inhibitors
作者:Kai Zhang、Huai-Wei Ding、Hao Ju、Qi Huang、Li-Juan Zhang、Hong-Rui Song、De-Cai Fu
DOI:10.1016/j.cclet.2015.04.025
日期:2015.6
A series of sulfenimine cephalosporin sulfoxide derivatives (7a-v) were designed, synthesized and evaluated for their inhibitory activity against TEM-1 and cephalosporinase in cell-free systems. Some of the tested compounds showed enhanced inhibitory activity against class C beta-lactamase cephalosporinase compared with the tazobactam. The most promising compounds 7c and 7n (IC50 = 7.6 and 8.6 mu mol/L, respectively) were further investigated in combination with cefradine against a variety of clinical isolated beta-lactamase-producing bacterial strains. (C) 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
Lazar, J.; Vinkler, E., Acta Chimica Academiae Scientiarum Hungaricae, 1980, vol. 105, p. 171 - 174
作者:Lazar, J.、Vinkler, E.
DOI:——
日期:——
LAZAR J.; VINKLER E., ACTA CHIM. ACAD. SCI. HUNG., 1979, 101, NO 1-2