- Atypical Carbapenem Antibiotics with Improved Activity Against Carbapenemase-Producing Acinetobacter baumannii
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The following invention deals with the design, preparation, evaluation, and use of carbapenem antibiotics with improved activity, relative to current commercially available carbapenem antibiotics, against infections involving multidrug resistant, carbapen
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Paragraph 0021
(2020/11/30)
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- Nano CuFe2O4: An efficient, magnetically separable catalyst for transesterification of β-ketoesters
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The preparation of a variety of β-ketoesters was achieved in high yields from methyl acetoacetate under neutral conditions through the utilization of magnetic CuFe2O4 nanoparticles as catalyst. Recycling of the catalyst was performed up to eight times without significant loss in activity. The catalyst was characterized using XRD, XPS, SEM and TEM techniques.
- Gohain, Mukut,Kumar, Vinod,Van Tonder, Johannes H.,Swart, Hendrik C.,Ntwaeaborwa, Odireleng M.,Bezuidenhoudt, Barend C. B.
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p. 18972 - 18976
(2015/03/04)
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- Metal salts as novel catalysts for efficient transesterification of β-ketoesters
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Ethyl/methyl β-ketoesters with alcohols in presence of catalytic amount of anhydrous metal salts (FeSO4, CuSO4) undergo smooth transesterification.
- Bandgar,Sadavarte,Uppalla
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p. 2063 - 2066
(2007/10/03)
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- Conversion of enamines, enamides and triazoles by trithiazyl trichloride into 1,2,5-thiadiazoles
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Trithiazyl trichloride 1 converts primary and secondary enamines, enamides and 1,2,3-triazoles into 1,2,5-thiadiazoles. These mild reactions provide one-pot routes to various alkyl, aryl, functional and quaternary 1,2,5-thiadiazoles, in moderate to good yields. The trimer 1 reacts as a 1,2-bis-electrophile adding an N-S unit across C=C-N. For primary enamines 15N-labelling reveals an additional, minor pathway in which N-S-N is added across C=C, with elimination of the enamine nitrogen. With N-alkylated enamines the alkyl group is retained in a quaternised thiadiazole, but this can be dealkylated in situ. Enamides react similarly but with spontaneous N-deacylation. 1,2,3-Triazoles with electron withdrawing groups to stabilise their acyclic diazoimine tautomers also give 1,2,5-thiadiazoles, with loss of dinitrogen. Mechanisms are proposed for these new reactions.
- Rees,Yue
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p. 662 - 667
(2007/10/03)
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- Solvent-free microwave-assisted organic reactions prepation of β-keto esters
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Microwave technique has been utilised in the preparation of β-keto esters. Two different procedures are described: transesterification of β- keto esters and ring opening of 2,2,6-trimethyl-1,3-dioxin-4-one.
- Gianotti, Massimo,Martelli, Giorgio,Spunta, Giuseppe,Campana, Eileen,Panunrio, Mauro,Mendozza, Monica
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p. 1725 - 1730
(2007/10/03)
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