Journal ArticleDOI
Unexpected formation of thiino[3',4':4,5]oxazolo[1,3-b][1,3]oxazepine derivatives
Akikazu Kakehi,Kennosuke Itoh,Hiroyuki Suga,Hirofumi Kobayashi,Hideyuki Muranaka,Motoo Shiro +5 more
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This article is published in Heterocycles.The article was published on 2011-05-01. It has received 4 citations till now. The article focuses on the topics: Oxazepine.read more
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β-Oxodithioesters: a new frontier for diverse heterocyclic architectures
TL;DR: In this article, a range of monocyclic and polycyclic heterocycles with several different heteroatoms is plotted in an easy and reader friendly manner and the tuning of catalysts and counter substrates towards selective utilization of its multiple reacting sites is summarized in the following discussion.
Journal ArticleDOI
A New Synthesis of 4,5,6,7-Tetrahydropyrazolo[1,5-c]pyrimidines by a Retro-Mannich Cascade Rearrangement
TL;DR: In this paper, a retro-Mannich reaction of in situ prepared pyrazolopyridines was discovered to give pyrazopyrimidines that have hitherto been underrepresented in the heterocyclic chemistry literature.
Journal ArticleDOI
Preparation of New Nitrogen-Bridged Heterocycles. Part 73. Unexpected Formation of Thiino[3′,4′:4,5]oxazolo[1,3-b][1,3]oxazepine Derivatives.
Akikazu Kakehi,Kennosuke Itoh,Hiroyuki Suga,Hirofumi Kobayashi,Hideyuki Muranaka,Motoo Shiro +5 more
TL;DR: In this article, unexpected products of type (III) are obtained from the cycloaddition reaction of (I) with (II) in the case of cyclo-cyclo-decomposition.
References
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Journal ArticleDOI
Photolysis of 2,6-dicyanopyridine 1-oxides☆
TL;DR: Iradiation of 2,6-dicyanopyridine 1-oxide in dichloromethane with > 290 mμ rays gave rise to 2, 6-dicsyano-1,3-oxazepine (VIIIa; 20%), 5-cyano-2-pyrrolecarbonyl cyanide (IXa) (20%), and an oxazepines tentatively assigned as 2,4- dicyano
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Photochemical studies. XVIII. Light-induced ring expansion of pyridine N-oxides
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Preparation of New Nitrogen-Bridged Heterocycles 72. A New Approach to 1-Acyl-3-(substituted methylthio)thieno[3′,4′:4,5]imidazo[1,5- a ]pyridine Derivatives
Akikazu Kakehi,Hiroyuki Suga,Yukihisa Okumura,Kennosuke Itoh,Kouji Kobayashi,Yoshihiro Aikawa,Kotaro Misawa +6 more
TL;DR: In this paper, the pyridinium salts, readily available from the S-alkylations of 3-amino-4-(1-pyrinio)thiophene-5-thiolates with various alkyl halides, in chloroform at room temperature afforded the corresponding thieno[3′,4′:4,5]imidazo[1,2-a]pyridine derivatives in low to moderate yields via the intramolecular cyclization of the resulting 1,5-dipoles followed
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Preparation of New Nitrogen-Bridged Heterocycles. 43.1 Synthesis and Reaction of 5aH-Pyrido[1,2-d][1,3,4]thiadiazepine Derivatives
TL;DR: For example, the authors showed that 1-pyridinio-and 1-(4-methylpyrinio)-amidates with dimethyl acetylenedicarboxylate in chloroform can yield 1:1 primary adducts, such as dimethyl 4-aryl-5-thia-2,3-diazatricyclo[4.3.2.02]undeca-3,8,10-triene-6,11-dicaroxylates in low to moderate yields.
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Preparation of New Nitrogen-Bridged Heterocycles. 36. Synthesis and Reaction of Dimethyl 4-Thia-1-azatetracyclo(5.4.0.05,11.06,8)undeca-2,9-diene-5,6-dicarboxylate Derivatives.
TL;DR: In this paper, the title compounds, dimethyl 4-thia-1-azatetracyclo[5.4.0.11.06,8]undeca-2,9-diene-5,6-dicarboxylates, were prepared in low to moderate yields by the reactions of various 1-pyridinio[(thiocarbonyl)methylide]s and 3-(1-polymorphic)thiophene-2-thiolates with dimethyl acetylenedic-arbox