- Process for producing novel naphthyridine derivatives
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A novel naphthyridine derivative showing high activity as a tachykinin receptor antagonist can be produced at high efficiency by reacting an acylating agent such as a carboxylic acid derivative with a compound represented by the formula (1): wherein R1, R2 and R3 represent independently a hydrogen atom, a lower alkyl group, a lower alkoxyl group, an aryl group, a heteroaryl group, an amino group, etc., and X1 and X2 represent respectively a halogen atom.
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- Preparation of Esters of Nonafluorobutanesulfonic Acid
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A series of new alkyl (2a-e), silyl (6a-l), germyl (7) and stannyl esters (8a, b) of nonafluorobutanesulfonic acid has been prepared by different methods (A-I) e.g.C4F9SO2OR and C4F9SO2OSiR3 .These compounds are useful and extremely powerful alkylating or silylating reagents. Key Words: Nonanfluorobutanesulfonic acid, alkyl and silyl esters / Alkylation / Silylation
- Frasch, Markus,Sundermeyer, Wolfgang,Waldi, Joachim
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p. 1763 - 1768
(2007/10/02)
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- Synthesis and Reactions of Perfluorobutanesulfonyl Hypohalites
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Two new hypohalites, perfluoro-n-butanesulfonyl hypochlorite and hypobromite, are reported.The hypochlorite is prepared by the low-temperature reaction of ClF with the acid C4F9SO2OH.The hypobromite is prepared by reaction of the hypochlorite with bromine.The new compounds contain very electrophilic halogen atoms and exhibit reactions similar to the analogous trifluoromethanesulfonates, CF3SO2OX (X=Cl, Br).The new hypohalites exhibit somewhat greater stability than the trifluoromethanesulfonates but form analogous decomposition products.Characterization of the newcompounds is given along with several reactions with olefins and halides to yield a variety of new esters.
- Johri, Kamalesh, K.,DesMarteau, Darryl D.
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p. 5081 - 5086
(2007/10/02)
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- Nucleoside Syntheses, XXII. Nucleoside Synthesis with Trimethylsilyl Triflate and Perchlorate as Catalysts
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The novel Lewis acids (CH3)3SiOSO2CF3 (5), (CH3)3SiOSO2C4F9 (6), and (CH3)3SiClO4 (4) are highly selective and efficient Friedel-Crafts catalysts for nucleoside formation from silylated heterocycles and peracylated sugars as well as for rearrangements of persilylated protected nucleosides.With basic silylated heterocycles these new catalysts give much higher yields of the natural N-1-nucleosides than with SnCl4.
- Vorbrueggen, Helmut,Krolikiewicz, Konrad,Bennua, Baerbel
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p. 1234 - 1255
(2007/10/02)
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