Attachment of Ketide Side Chains on Methyl-1,4-naphthoquinones for biomimetic type angucycline syntheses
摘要:
The Michael addition of nucleophiles 5-10 derived from beta-ketoesters with the methyl-1,4-naphthoquinones 16 and 20 was systematically investigated in connection with a biomimetic type synthesis of angucyclinone antibiotics. Drawbacks of these reactions were the formation of regioisomers (e.g. 12/13 and 18/19), unwanted cyclizations (14 and 15), and occasional 1,2-addition (23). No side reactions and a good overall yield (80%) in the attachment of a C-3-2-oxoside chain was achieved by Stille reaction of allyl stannane 11 with the bromoquinone 24 followed by cleavage of the double bond to yield ketone 26.
NOVEL PREPARATION OF ANTICANCER-ACTIVE TRICYCLIC COMPOUNDS VIA ALKYNE COUPLING REACTION
申请人:IIDA Akira
公开号:US20120077986A1
公开(公告)日:2012-03-29
The present invention is directed to provide a novel preparation of anticancer-active tricyclic compounds via alkyne coupling reaction. The present invention provides a process for preparing a compound of formula (Ia) or (Ib):
wherein R
1
is optionally substituted C
1-6
alkyl, etc.; W is O, S or NR
2
; R
2
is hydrogen atom, etc.,
which comprises Step (a) in which a compound of formula (II):
wherein R
1
is the same as defined above,
and a compound of formula (III) or (IV):
wherein R
2
is the same as defined above; R
3
is hydrogen atom, etc.; X is halogen atom, etc., are reacted in the presence of a base, a copper catalyst and a palladium catalyst in an aprotic polar solvent.
Untersuchungen an 1,4-Napthochinonen, 24. Mitt.: Zur Dehalogenierung von 2-/3-Halogen-1,4-naphthochinon-derivaten
作者:Gotthard Wurm、Hans-Jürgen Duchstein
DOI:10.1002/ardp.19953280219
日期:——
Während Bu3SnH ein effektives Reagenz zur Debromierung von 2‐Bromnaphthochinonen ist, erfolgt Cl‐Eliminierung bei Einsatz von 1c nur zu 30%. Mit Et3SiH ist überhaupt keine Dechlorierung zu erreichen, dafür entsehen mit den 5‐Acetoxyderivaten 1a/1d als Startkomponenten die cyclischen Acetale 3a–c als selektiv geschützte Juglonderivate. Die Bromverbindung 3a entsteht nur bei Temp. unterhalb 10°, bereits
Effective One-Pot Synthesis of 5-Hydroxy-1,4-naphthoquinone Derivatives
作者:Sadao Tsuboi、Takuzo Komiyama、Yutaka Takaguchi
DOI:10.1055/s-2006-926417
日期:2006.5
In the presence of triethylamine, Diels-Alder reaction, involving decarboxylation-oxidation reaction of 3-hydroxy-2-pyrones with 1,4-benzoquinones gave 5-hydroxy-1,4-naphthoquinone derivatives in excellent to reasonable yields.
Untersuchungen an 1,4-Naphthochinonen, 19. Mitt.: 2-, 3- und 6-Methyljuglon aus Formylnaphtholen
作者:Gotthard Wurm、Bernd Goeßler
DOI:10.1002/ardp.19893220912
日期:——
Die Methylnaphthole 9 und 10 sind geeignete Komponenten zur Synthese von Plumbagin, 6‐Methylplumbagin (14) und3‐Methylnaphthazarin (12). 9 und 10 entstehen aus 5 und 6, diedurch Formylierung der Naphthole 2 und3 synthetisiert werden. Da es nicht möglich war, das Formylnaphthol 8 auf demselben Weg zu gewinnen, wurde Isoplumbagin (18) durch Brom‐Lithium‐Austausch von 16 als Schlüsselverbindung und
Inhibition of anaerobic glucose metabolism and corresponding composition as a natural non-toxic approach to cancer treatment
申请人:Mazzio Anne Elizabeth
公开号:US20060035981A1
公开(公告)日:2006-02-16
This invention discloses a method and formulation for treatment/prevention of human and animal cancers. The invention is designed to exploit the vulnerability of cancer with regards to its anaerobic requirement for non-oxidative phosphorylation of glucose to derive energy, which is opposite to the host. The composition is comprised of a combination of one or more of (A) 2,3-dimethoxy-5-methyl-1,4-benzoquinone, ubiquinones (5-45) (B) compound(s) capable of augmenting oxidative phosphorylation such as a riboflavin containing compound and/or ubiquinone (50) (C) 2′,3,4′5,7-pentahydroxyflavone or a lactic acid dehydrogenase inhibitor and (D) compounds (s) that antagonize gluconeogenesis from non-glucose carbon based substrates. The combination of these substances should favor oxidative loss of carbon through decarboxylation reactions, suppress gluconeogenesis and initiate collapse of glycolysis in tumor tissue, a chemical manipulation that should be non-toxic or perhaps even beneficial to normal respiring host tissue. Pilot studies indicate the treatment to be effective without side effects.