A novel tandem approach to trisubstituted γ-sultams has been developed involving N-alkylation of methanesulfonanilides with EWG-substituted allyl bromides followed by intramolecular Michael addition. A series of various isothiazolidine 1,1-dioxides have been prepared under mild transition-metal-free conditions in high yields and trans-diastereoselectivity (confirmed by X-ray crystallography). The dependence
synthesized compounds and were assayed for antioxidantactivity. The bis(arylaminosulfonylmethylazolyl)pyridines showed higher radical scavenging activity than the bis(arylsulfonylmethylazolyl)pyridines. Besides, unsubstituted, and methyl substituted compounds exhibited greater activity. Among all the tested compounds 8b and 11b were identified as potential antioxidants.
采用绿色方法超声法,由合成中间体甲基芳基磺酰基乙酸酰肼和甲基芳基氨基磺酰基乙酸酰肼合成了新型的双(芳基磺酰基甲基偶氮基)吡啶和双(芳基氨基磺酰基甲基-偶氮基)吡啶。所有合成的化合物均具有较高的收率和较短的反应时间。光谱参数,例如IR,1 H NMR,13 C NMR,质量和微量分析用于确定所有合成化合物的结构,并测定其抗氧化活性。的双(arylaminosulfonylmethylazolyl)吡啶显示出更高的自由基清除活性比二(芳基磺酰基甲基偶氮基)吡啶。此外,未取代的和甲基取代的化合物表现出更大的活性。在所有测试化合物中,8b和11b被确定为潜在的抗氧化剂。
Synthesis and Antimicrobial Activity of Pyrrolyl/Pyrazolyl Arylaminosulfonylmethyl 1,3,4-Oxadiazoles, 1,3,4-Thiadiazoles and 1,2,4-Triazoles
A new class of pyrrolyl/pyrazolyl arylaminosulfonylmethyl 1,3,4-oxadiazoles, 1,3,4-thiadiazoles, and 1,2,4-triazoles were prepared and tested for antimicrobial activity. Amongst the tested compounds, 5c displayed high antimicrobial activity.
A new class of sulfonamido bis heterocycles—pyrrolyl/pyrazolyl‐oxadiazoles, thiadiazoles, and triazoles—were prepared from arylaminosulfonylacetic acid hydrazide and E‐aroylethenesulfonylacetic acid adopting simple and versatile synthetic methodologies.
A new class of oxadiazoles is prepared by treating aminosulfonylacetic acids with different carboxylic acid hydrazides. Interconversion of oxadiazoles to thiadiazoles is carried out with thiourea. The compounds are screened for antimicrobial and antioxidant activities. (C) 2010 Elsevier Masson SAS. All rights reserved.