Novel sulfone-linked bis heterocycles pyrazolines in combination with thiadiazoles, oxadiazoles and triazoles were prepared from E-styrylsulfonylacetic acid methyl ester and tested for their antimicrobialactivity. The compound 8 showed pronounced activity than the compounds 6 and 7.
Synthesis of Sulfones <i>via</i> Ru(II)-Catalyzed Sulfination of Boronic Acids
作者:Krista Gulbe、Ma̅ris Turks
DOI:10.1021/acs.joc.9b03403
日期:2020.4.17
Ruthenium(II) complexes catalyze the insertion of sulfur dioxide into (het)aryl and alkenyl boronic acids. The transmetalation–sulfination process proceeds with DABSO in the presence of 5 mol % RuCl2(PPh3)3 in methanol at 100 °C. The intermediate sulfinate salt can be quenched with various electrophiles such as alkyl halides, epoxides, Michael acceptors, and λ3-iodanes in moderate to good yields. The
Synthesis and Biological Activity of a New Class of Sulfone-Linked Pyrrolylpyrazoles and Pyrrolylisoxazoles from Methyl-3-aryl-2-(E-arylethenesulfonyl)acrylate
A new class of sulfone-linked bis heterocycles, methyl-3-(4′-aryl-1′H-pyrazol-3′-ylsulfonyl)-4-aryl-3H-pyrrole-3-carboxylate (8), methyl-3-(1′-phenyl-3′,5′-diaryl-1′H-pyrazol-4′-ylsulfonyl)-4-aryl-3H-pyrrole-3-carboxylate (9) and methyl-3-(3′,5′-diarylisoxazol-4′-ylsulfonyl)-4-aryl-3H-pyrrole-3-carboxylate (10) were prepared by the regioselective reaction of methyl-3-aryl-2-(E-arylethenesulfonyl)acrylate (2) with tosylmethyl isocyanide followed by fuctionalization of olefin moiety with 1,3-dipolar reagents. The lead compounds were tested for their antimicrobial activity.
A New Method for the Preparation of (E)-2-(Styrylsulfonyl)acetic Acid Esters and Their Reactions with Hydrazine Hydrate
作者:Norton Peet、Son Nguyen
DOI:10.1055/s-0030-1259974
日期:2011.4
A new route to esters of (E)-2-(styrylsulfonyl)acetic acid has been developed. Treatment of the methyl ester with hydrazine hydrate gave the six-membered 4-amino-5-phenylthiomorpholine-3-one 1,1-dioxide (1), and not the seven-membered 6-phenyl-1,4,5-thiadiazepane-3-one 1,1-dioxide (2) as previously described by others. In contrast, treatment of the ethyl ester with the same reagent provided a separable