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Photoswitchable Nine-Membered Cyclic Enediynes And Enyne-Allenes
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Dinesh Pandithavidana,Paperback, English-language edition,Pub by AV Akademikerverlag GmbH & Co. KG. Books Books ~~ Science~~ Chemistry ~~ Organic PHOTOSWITCHABLE-NINE-MEMBERED-CYCLIC-ENEDIYNES-AND-ENYNE-ALLENES~~Dr-Dinesh-Pandithavidana AV Akademikerverlag GmbH & Co. KG. The extreme cytotoxicity of natural enediyne antibiotics is attributed to the ability of the (Z)-3-ene-1,5-diyne fragment incorporated into a 10- or 9-membered ring cyclic system to undergo Bergman cyclization and producing dDNA-damaging p-benzyne diradical. The rate of this reaction strongly depends on the ring size. Thus 11-membered ring enediynes are stable, 10-membered ring analogs undergo slow cycloaromatization under ambient conditions or mild heating. Very little is known about reactivity of 9-membered ring enediynes due to their instability. We have developed thermally stable photo-precursors of 9-membered enediynes, in which one of the triple bonds is replaced by the cyclopropenone group. UV irradiation of the photo-precursor results in the efficient decarbonylation and the formation of reactive enediyne. The latter undergoes clean cycloaromatization spontaneously with absence of any chemical additives. Synthetic strategies of a series of cyclopropenone containing nine-membered enediyne precursors and DNA-cleavaging activity of the photo-generated enediynes have been also discussed.

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PHOTOSWITCHABLE NINEMEMBERED CYCLIC ENEDIYNES AND ENYNEALLENES - Dr Dinesh Pandithavidana
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[PU: LAP Lambert Academic Publishing], Das BuchPHOTOSWITCHABLE NINEMEMBERED CYCLIC ENEDIYNES AND ENYNEALLENESkönnte eine längere Lieferzeit habenSie zahlen eine Versandpauschale für bis zu fünf Bücher Typ:book The extreme cytotoxicity of natural enediyne antibiotics is attributed to the ability of the (Z)3ene15diyne fragment incorporated into a 10 or 9membered ring cyclic system to undergo Bergman cyclization and producing dDNAdamaging pbenzyne diradical The rate of this reaction strongly depends on the ring size Thus 11membered ring enediynes are stable 10membered ring analogs undergo slow cycloaromatization under ambient conditions or mild heating Very little is known about reactivity of 9membered ring enediynes due to their instability We have developed thermally stable photoprecursors of 9membered enediynes in which one of the triple bonds is replaced by the cyclopropenone group UV irradiation of the photoprecursor results in the efficient decarbonylation and the formation of reactive enediyne The latter undergoes clean cycloaromatization spontaneously with absence of any chemical additives Synthetic strategies of a series of cyclopropenone containing, [SC: 0.00], Neuware, gewerbliches Angebot, [GW: 1519g]

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PHOTOSWITCHABLE NINE-MEMBERED CYCLIC ENEDIYNES AND ENYNE-ALLENES: CYCLOPROPENONE-CONTAINING CYCLIC ENEDIYNE AND ENYNE-ALLENE PRECURSORS AS PROTOTYPE PHOTOSWITCHABLE ANTITUMOR AGENTS - Dr. Dinesh Pandithavidana
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2011, ISBN: 3844322876

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PHOTOSWITCHABLE NINE-MEMBERED CYCLIC ENEDIYNES AND ENYNE-ALLENES

The extreme cytotoxicity of natural enediyne antibiotics is attributed to the ability of the (Z)-3-ene-1,5-diyne fragment incorporated into a 10- or 9-membered ring cyclic system to undergo Bergman cyclization and producing dDNA-damaging p-benzyne diradical. The rate of this reaction strongly depends on the ring size. Thus 11-membered ring enediynes are stable, 10-membered ring analogs undergo slow cycloaromatization under ambient conditions or mild heating. Very little is known about reactivity of 9-membered ring enediynes due to their instability. We have developed thermally stable photo-precursors of 9-membered enediynes, in which one of the triple bonds is replaced by the cyclopropenone group. UV irradiation of the photo-precursor results in the efficient decarbonylation and the formation of reactive enediyne. The latter undergoes clean cycloaromatization spontaneously with absence of any chemical additives. Synthetic strategies of a series of cyclopropenone containing nine-membered enediyne precursors and DNA-cleavaging activity of the photo-generated enediynes have been also discussed.

Detailangaben zum Buch - PHOTOSWITCHABLE NINE-MEMBERED CYCLIC ENEDIYNES AND ENYNE-ALLENES


EAN (ISBN-13): 9783844322873
ISBN (ISBN-10): 3844322876
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Taschenbuch
Erscheinungsjahr: 2011
Herausgeber: LAP Lambert Academic Publishing

Buch in der Datenbank seit 03.05.2009 19:18:27
Buch zuletzt gefunden am 31.10.2017 11:45:13
ISBN/EAN: 3844322876

ISBN - alternative Schreibweisen:
3-8443-2287-6, 978-3-8443-2287-3


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