- Preparation of new nitrogen-bridged heterocycles. 60. Syntheses and conformational analyses of bis(indolizin-1-yl) disulfides
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Some bis(indolizin-1-yl) disulfides, readily obtainable from the treatment of 1-(benzoylthio)indolizines with piperidine, were prepared and their conformations were investigated. In comparison with those of 1-(benzoylthio) indolizines, the 1H-N
- Kakehi, Akikazu,Suga, Hiroyuki,Okuno, Hiroko,Okuhara, Masaki,Ohta, Akira
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p. 1458 - 1465
(2008/03/11)
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- Preparation of New Nitrogen-Bridged Heterocycles. 15. Synthesis and Reaction of 1,9a-Dihydropyridothiazines
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Alkaline treatment of 1-pyridinium bromides, readily obtainable from the S-alkylation of pyridinium 1-(thiocarbonyl)methylides with various alkyl bromides such as bromoacetonitrile, ethyl bromoacetate, and some phenacyl bromides, gave smoothly 1,9a-dihydropyridothiazine derivatives as almost isomeric mixtures.These dihydropyridothiazines are very unstable and decomposed rapidly at ordinary temperature, but by treating them with a dehydrogenating agent such as lead tetraacetate (LTA) or 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) at 0 deg C the desulfurized and the rearrangement aromatic indolizine derivatives were formed in moderate to good yields.
- Kakehi, Akikazu,Ito, Suketaka,Yonezu, Shingo,Maruta, Katsunori,Yuito, Kazuhiro,et al.
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p. 1867 - 1880
(2007/10/02)
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