Výsledky vyhledávání - "Paw Wang Yang"

Synthesis and Reactivities of 1,5- and 1,7-Azulenequinone Derivatives. A Highly Convenient, One-Pot Synthesis of 3-Bromo-1,5- and −1,7-Azulenequinones by Bromination of Azulene

Autor: Masaaki Tsukada, Hidetsugu Wakabayashi, Paw-Wang Yang, T. Nozoe, Kimio Shindo, Teruo Kurihara, Masafumi Yasunami

Publikováno v: Journal of the Chinese Chemical Society. 45:391-400

A very convenient, one-pot synthesis (over 80% yield) of 3-bromo-1,5- and −1,7-azulenequinones has been developed by bromination of azulene in aqueous tetrahydrofuran. Reduction of 3-bromo-1,5- and −1,7-azulenequinones with tin or zinc powder in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e948b14b75ba9695a4aaa8085708c0a7
https://doi.org/10.1002/jccs.199800062

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Single-strand cleavage of DNA with site-specificity by photolysis of azulenequinones

Autor: Paw Wang Yang, Jih Ru Hwu, Shwu-Chen Tsay, Chun Chieh Lin, Lung Ching Lin, Tetsuo Nozoe, Sheng-Fa Yu

Publikováno v: Bioorganic & Medicinal Chemistry Letters. 7:975-978

Single-strand cleavage of DNA in a phosphate buffer at pH 6.0 was accomplished by photolysis of various 1,5- and 1,7-azulenequinones with 350-nm UV light; results from the analysis of a 32 P-end-labeled DNA fragment obtained by gel electrophoresis in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d356eff6283c30790c05c25577ff7311
https://doi.org/10.1016/s0960-894x(97)00153-4

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Formation of 3-Bromo-1,5- and −1,7-Azulenequinones from 1-Alkyl-and 1-Phenylazulenes by Substituent Extrusion on the Bromine- Oxidation in Aqueous THF. Remarkable Substituent Effects on the Product Distribution

Autor: Hidetsugu Wakabayashi, Akifumi Takano, Kimio Shindo, Masafumi Yasunami, Jhy-An Chen, Paw-Wang Yang, The Late Tetsuo Nozoe

Publikováno v: Journal of the Chinese Chemical Society. 43:301-304

Oxidation of 1-ethyl-, 1-propylazulenes, and their 5-isopropyl derivatives with bromine gave 3-bromo-1,5- and 3-bromo-l,7-azulenequinones (Type A) together with 3-bromo-l-hydroxy-5-isopropyl-l-alkylazulen-7-one and its isomeric products (Type B), whi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2c6ed135b69ff09e9ebbdc163557d9b1
https://doi.org/10.1002/jccs.199600044

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Formation of Azulenequinone Derivatives from Variously Functionalized Azulenes by Bromine-oxidation

Autor: Hidetsugu Wakabayashi, T. Nozoe, Teruo Kurihara, Jhy-An Chen, Chi-Phi Wu, Kimio Shindo, Paw-Wang Yang, Masafumi Yasunami

Publikováno v: Journal of the Chinese Chemical Society. 44:5-7

Variously functionalized 1,5- and 1,7-azulenequinones were easily derived in one-pot in 30-50% yield from the bromine-oxidation of 2-methoxyazulene and 2-methyl derivatives of 1-cyano-, 1-methoxycarbonyl- and its 7-isopropyl derivatives, while 1-meth

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8e5776ef67363c10ecd054069fc1f418
https://doi.org/10.1002/jccs.199700002

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A Convenient, One-Pot Synthesis of Azulenes Having Versatile Functional Groups by the Reaction of 2H-Cyclohepta[b]furan-2-ones with Furan Derivatives

Autor: Hidetsugu Wakabayashi, Sumio Ishikawa, Chi-Phi Wu, Tetsuo Nozoe, Paw-Wang Yang, Kimio Shindo

Publikováno v: HETEROCYCLES. 34:429

2-Acylmethyl- and 2-methoxycarbonylmethylazulene derivatives having versatile functional groups in the side chain, are synthesized in one-pot by the reaction of 2H-cyclohepta [b] furan-2-ones with furans on heating at 160-190 ° C in aprotic solvent

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cc98ce1d2e9d125831326651d315e925
https://doi.org/10.3987/com-91-5936

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A Convenient, One-Pot Azulene Synthesis from 2H-Cyclohepta[b]furan-2-ones with Vinyl Ether and Its Analogues III. Orthoesters as a reagent

Autor: Sumio Ishikawa, Tetsuo Nozoe, Chi-Phi Wu, Paw-Wang Yang, Hidetsugu Wakabayashi, Kimio Shindo

Publikováno v: HETEROCYCLES. 32:213

2-Alkoxy and 2,4-dialkoxyazulene derivatives were synthesized in one-pot and in good yields by the reaction of 2H-cyclohepta[b]furan-2-ones with orthoesters on heating either neat or in an aprotic solvent at 160-190 o C

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a3f57779fe0fc0be66e0d9f2565acf6e
https://doi.org/10.3987/com-90-5628

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A Convenient, One-Pot Azulene Synthesis from Cyclohepta[b]furan-2-ones and Vinyl Ether and Its Analogues. (II). Acetals as Reagent

Autor: Sumio Ishikawa, Tetsuo Nozoe, Hidetsugu Wakabayashi, Chi-Phi Wu, Paw-Wang Yang

Publikováno v: HETEROCYCLES. 31:17

Title synthesis by the reaction of cyclohepta[b]-furan-2-ones with acetals of several aldehydes and ketones on heating at 160-190 o C in neat or aprotic solvent

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::957046374c4bccd7ef42ca4fa3549751
https://doi.org/10.3987/com-89-5210

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THE FACILE SYNTHESIS OF 1- AND 2-ALKYLAZULENES BY THE REACTIONS OF 2H-CYCLOHEPTA[b]FURAN-2-ONES WITH ENAMINES OF ALDEHYDES AND ACYCLIC KETONES

Autor: Alice Chen, Masafumi Yasunami, Kahei Takase, Paw-Wang Yang

Publikováno v: Chemistry Letters. 9:579-582

The reactions of 2H-cyclohepta[b]furan-2-one and its 3-cyano derivatives with enamines derived from aldehydes and acyclic ketones were investigated. On the reactions, 1- and 2-alkylazulenes were easily synthesized.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f480b44c73d958af7370384cb587e194
https://doi.org/10.1246/cl.1980.579

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