Arylation and alkenylation of activated alkyl halides using sulfonamides
作者:Stuart Johnson、Ervin Kovács、Michael F. Greaney
DOI:10.1039/d0cc00220h
日期:——
of quaternary aryl amino acid derivatives can be synthesised using tandem SN2/Smiles rearrangement chemistry involving aryl sulfonamides and α-chloro carbonylcompounds. The reaction harnesses a sulfur dioxide extrusion pathway to construct a C-N and C-Caryl bond under simple conditions with no requirement for organometallics or transition metal catalysts. The reaction is also successful for alkenyl
Styrylamidines are prepared by treating styrylsulfonylamidines with base. The styrylamidines are effective in the prevention of aggregation of blood platelets and as analgesics. Compounds of the invention are also useful as anticonvulsants, diuretics and antihypertensive agents. The styrylsulfonylamidines of the invention which serve as precursors to the styrylamidines also have analgesic properties. Illustrative of the styrylamidines of the present invention are 4-amino-N-(4-aminostyryl)benzamidine and N-(3,4-dichlorostyryl)acetamidine. An example of a styrylsulfonylamidine is N-(styrylsulfonyl)acetamidine.
The Photobromination of β-Styrenesulfonamides and Syntheses of 2-Arylacetylene-1-sulfonamides
作者:Kiyoshi Hasegawa、Syuzi Hirooka、Hiroshi Kawahara、Atsushi Tanaka、Masahiro Nomura、Yutaka Hori
DOI:10.1246/bcsj.50.2346
日期:1977.9
The photobromination of trans-β-styrenesulfonamides in acetic acid at 16–18 °C gave about 75 : 25 mixtures of threo (cis adducts)- and erythro-1,2-dibromo-2-arylethane-1-sulfonamides (trans adducts). A similar photobromination of cis-β-styrenesulfonamide afforded a 33 : 67 mixture of the threo (trans adduct)- and the erthro-dibromides (cis adduct). The diastereomers could be separated by fractional
反式-β-苯乙烯磺酰胺在乙酸中在 16–18 °C 下发生光溴化反应,得到约 75:25 的苏式(顺式加合物)和赤式-1,2-二溴-2-芳基乙烷-1-磺酰胺(反式加合物)的混合物. 顺式-β-苯乙烯磺酰胺的类似光溴化得到苏式(反式加合物)-和叔-二溴化物(顺式加合物)的 33:67 混合物。非对映异构体可以通过分级重结晶来分离。显示顺式加合物既不是通过二次异构化也不是通过(可能)离子加成形成的。苏式和赤式二溴化物与 Et3N 的反式脱溴化氢分别得到 (Z)- 和 (E)-β-溴-β-苯乙烯磺酰胺,它们在 45-50 °C 下用 1 M NaOH 水溶液进一步轻松脱溴化为得到2-芳基乙炔-1-磺酰胺。
Substituted 2,2-dimethyl-5-phenoxypentanoic acid benzamides and their production
申请人:WARNER-LAMBERT COMPANY
公开号:EP0134337A1
公开(公告)日:1985-03-20
New substituted 2,2-dimethyl-5-phenoxy-pentanoic acid benzamides which are useful as antiarteriosclerotic agents are disclosed. These compounds elevate the high density lipoprotein fraction of cholesterol, and also lower the low density lipoprotein fraction of cholesterol. They have the following formula:
wherein R1, R2, A and B are various substituents, and k is 0 or 1.
Green approach for the synthesis of thiophenyl pyrazoles and isoxazoles by adopting 1,3-dipolar cycloaddition methodology and their antimicrobial activity
A variety of N-((1,3-dipheny1-5-aryl-1H-pyrazol-4-yl)sulfonyl)thiophene-2-carboxamides (7) and N-((5ary1-3-phenylisoxazol-4-yl)sulfonyl)thiophene-2-carboxamides (8) were prepared from (E)-N-(aryl-ethenesulfonyl)thiophene-2-carboxamides (4) adopting 1,3 -dipolar cycloaddition of nitrile imines and nitrile oxides generated from araldehyde phenylhydrazones and araldoximes in the presence of iodosobenzene and CTAB followed by oxidation with 12 in DMSO. The compounds 4f, 7e, 7f, 8e and 8f showed potential antibacterial activity against B. subtilis whereas Se and 8f exhibited potential antifungal activity against A. niger. (C) 2017 Elsevier Masson SAS. All rights reserved.