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1

Four New Isoflavonoids and a New 2-Arylbenzofuran from the Roots of Erythrina variegata.

Hitoshi Tanaka, Miyuki Hirata, Hideo Etoh, Magoichi Sako, Masaru Sato, Jin Murata, Hiroko Murata, Dedy Darnaedi, Toshio Fukai

Journal:

Year:

2004

File:

PDF, 91 KB

2004

2

Regioselective Oxidative Coupling of 4-Hydroxystilbenes: Synthesis of Resveratrol and ε-Viniferin ( E )-Dehydrodimers

Sako, Magoichi, Hosokawa, Hiroyuki, Ito, Tetsuro, Iinuma, Munekazu

Journal:

Journal of Organic Chemistry

Year:

2004

Language:

english

File:

PDF, 61 KB

english, 2004

3

A simple and efficient synthesis of the ?-lactam analogue of ?-lactam antibiotics. Ring-expansion of penicillins to homopenicillins

Maki, Yoshifumi, Sako, Magoichi, Kurahashi, Nobuyuki, Hirota, Kosaku

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1988

Language:

english

File:

PDF, 200 KB

english, 1988

4

Separation of N2-ethyl-2'-deoxyguanosine-5'-monophosphate and four native deoxyribonucleoside monophosphates using capillary zone electrophoresis with polyethylene glycol as buffer additive

Yukihiro Esaka, Shinsuke Inagaki, Masashi Goto, Magoichi Sako

Journal:

ELECTROPHORESIS

Year:

2001

Language:

english

File:

PDF, 101 KB

english, 2001

5

Analysis of DNA adducts bases by capillary electrophoresis with amperometric detection

Shinsuke Inagaki, Yukihiro Esaka, Magoichi Sako, Masashi Goto

Journal:

ELECTROPHORESIS

Year:

2001

Language:

english

File:

PDF, 63 KB

english, 2001

6

Six New Constituents from the Roots of Erythrina variegata

Hitoshi Tanaka, Miyuki Hirata, Hideo Etoh, Magoichi Sako, Masaru Sato, Jin Murata, Hiroko Murata, Dedy Darnaedi, Toshio Fukai

Journal:

Chemistry & Biodiversity

Year:

2004

Language:

english

File:

PDF, 127 KB

english, 2004

7

ChemInform Abstract: A Convenient Method for the Preparation of N2-Ethylguanine Nucleosides and Nucleotides.

Magoichi Sako, Hiroyoshi Kawada, Kosaku Hirota

Journal:

Year:

1999

File:

PDF, 32 KB

1999

8

ChemInform Abstract: Highly Increased Cellular Accumulation of Vincristine, a Useful Hydrophobic Antitumor-Drug, in Multidrug-Resistant Solid Cancer Cells Induced by a Simply Reduced Taxinine.

Magoichi Sako, Hikokazu Suzuki, Noriyuki Yamamoto, Kosaku Hirota

Journal:

Year:

2000

File:

PDF, 28 KB

2000

9

Eryvarins F (I) and G (II), Two 3-Phenoxychromones from the Roots of Erythrina variegata.

Hitoshi Tanaka, Miyuki Hirata, Hideo Etoh, Hiroshi Shimizu, Magoichi Sako, Jin Murata, Hiroko Murata, Dedy Darnaedi, Toshio Fukai

Journal:

Year:

2003

File:

PDF, 65 KB

2003

10

Two New Isoflavonoids and a New 2-Arylbenzofuran from the Roots of Erythrina variegata

Hitoshi Tanaka, Masaru Sudo, Miyuki Hirata, Magoichi Sako, Masaru Sato, Ih-Sheng Chen, Toshio Fukai

Journal:

Year:

2005

File:

PDF, 12 KB

2005

11

Eryvarins F and G, two 3-phenoxychromones from the roots of Erythrina variegata

Hitoshi Tanaka, Miyuki Hirata, Hideo Etoh, Hiroshi Shimizu, Magoichi Sako, Jin Murata, Hiroko Murata, Dedy Darnaedi, Toshio Fukai

Journal:

Year:

2003

Language:

english

File:

PDF, 167 KB

english, 2003

12

An arylbenzofuran and four isoflavonoids from the roots of Erythrina poeppigiana

Hitoshi Tanaka, Tomoko Oh-Uchi, Hideo Etoh, Magoichi Sako, Masaru Sato, Toshio Fukai, Yoichi Tateishi

Journal:

Year:

2003

Language:

english

File:

PDF, 216 KB

english, 2003

13

Isoflavonoids from roots of Erythrina zeyheri

Hitoshi Tanaka, Tomoko Oh-Uchi, Hideo Etoh, Magoichi Sako, Fujio Asai, Toshio Fukai, Masaru Sato, Jin Murata, Yoichi Tateishi

Journal:

Year:

2003

Language:

english

File:

PDF, 215 KB

english, 2003

14

Photo-oxidative cyclisation of 2'-hydroxychalcones leading to flavones induced by heterocycle n-oxides : high efficiency of pybimido[54-g]pteridine n-oxide for the photochemical dehydrogenation

Yoshifumi Maki, Kaoru Shimada, Magoichi Sako, Kosaku Hirota

Journal:

Year:

1988

Language:

english

File:

PDF, 620 KB

english, 1988

15

Photochemical oxygenation of styrene by pyrimido[5,4,G]pteridine 10- oxide as a chemical mimic of hemin-catalysed oxygenation

Magoichi Sako, Seiji Ohara, Kosaku Hirota, Yoshifumi Maki

Journal:

Year:

1990

Language:

english

File:

PDF, 543 KB

english, 1990

16

Reductive debromination of 5-bromouracils by 1-benzyl-1,4-dihydronicotinamide

Magoichi Sako, Kosaku Hirota, Yoshifumi Maki

Journal:

Year:

1983

Language:

english

File:

PDF, 281 KB

english, 1983

17

A convenient preparative method for the 1,N2-cyclic adducts of guanine nucleosides and nucleotides with crotonaldehyde

Magoichi Sako, Isamu Yaekura

Journal:

Year:

2002

Language:

english

File:

PDF, 155 KB

english, 2002

18

Facile homolytic substitution of N(6)-benzoyladenosines

Yoshifumi Maki, Keiji Kameyama, Magoichi Sako, Kosaku Hirota

Journal:

Tetrahedron Letters

Year:

1983

Language:

english

File:

PDF, 238 KB

english, 1983

19

Photochemical oxidative CαCβ bond cleavage of tryptophan side-chain by pyrimido[5,4-g]pteridine N-oxide

Magoichi Sako, Kaoru Shimada, Kosaku Hirota, Yoshifumi Maki

Journal:

Tetrahedron Letters

Year:

1986

Language:

english

File:

PDF, 288 KB

english, 1986

20

Efficient oxygen-atom transfer agent: photochemical hydroxylation of benzene derivatives by pyrimido[5,4-g]pteridine n-oxide

Magoichi Sako, Kaoru Shimada, Kosaku Hirota, Yoshifumi Maki

Journal:

Tetrahedron Letters

Year:

1985

Language:

english

File:

PDF, 241 KB

english, 1985

21

A novel synthesis of pyrimidopteridine-10-oxides

Yoshifumi Maki, Magoichi Sako, Edward C. Taylor

Journal:

Tetrahedron Letters

Year:

1971

Language:

english

File:

PDF, 211 KB

english, 1971

22

Smooth and selective formation of the cyclic 1,N2-propano adducts in the reactions of guanine nucleosides and nucleotides with acetaldehyde

Magoichi Sako, Isamu Yaekura, Yoshihiro Deyashiki

Journal:

Tetrahedron Letters

Year:

2002

Language:

english

File:

PDF, 71 KB

english, 2002

23

Oxidative hydrolysis of a cyclic 1,N2-propano-2′-deoxyguanosine, an adduct of 2′-deoxyguanosine with acetaldehyde or crotonaldehyde

Magoichi Sako, Shinsuke Inagaki, Yukihiro Esaka, Yoshihiro Deyashiki

Journal:

Tetrahedron Letters

Year:

2003

Language:

english

File:

PDF, 127 KB

english, 2003

24

Histones accelerate the cyclic 1,N2-propanoguanine adduct-formation of DNA by the primary metabolite of alcohol and carcinogenic crotonaldehyde

Magoichi Sako, Shinsuke Inagaki, Yukihiro Esaka, Yoshihiro Deyashiki

Journal:

Bioorganic & Medicinal Chemistry Letters

Year:

2003

Language:

english

File:

PDF, 108 KB

english, 2003

25

Highly increased cellular accumulation of vincristine, a useful hydrophobic antitumor-drug, in multidrug-resistant solid cancer cells induced by a simply reduced taxinine

Magoichi Sako, Hikokazu Suzuki, Noriyuki Yamamoto, Kosaku Hirota

Journal:

Bioorganic & Medicinal Chemistry Letters

Year:

1999

Language:

english

File:

PDF, 261 KB

english, 1999

26

Analysis of DNA adducts of acetaldehyde by liquid chromatography–mass spectrometry

Shinsuke Inagaki, Yukihiro Esaka, Yoshihiro Deyashiki, Magoichi Sako, Masashi Goto

Journal:

Journal of Chromatography A

Year:

2003

Language:

english

File:

PDF, 421 KB

english, 2003

27

Oxidative photocyclization of N6-benzoyladenosine derivatives. Facile formation of the quinazolinopurine ring system

Kaoru Shimada, Magoichi Sako, Kosaku Hirota, Yoshifumi Maki

Journal:

Tetrahedron Letters

Year:

1987

Language:

english

File:

PDF, 215 KB

english, 1987

28

Nucleosides. Part 5. Isolation and characterization of the stable cyclic adducts, (5R,6S)- and (5S,6S)-bromo-O 6,5?-cyclo-5,6-dihydrouridines in the bromination of 2?,3?-O-isopropylideneuridine with N-bromosuccinimide

Hirota, Kosaku, Tomishi, Tetsuo, Sako, Magoichi, Maki, Yoshifumi

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1988

Language:

english

File:

PDF, 517 KB

english, 1988

29

A Newly Devised Method for the Debenzylation of N 6 -Benzyladenosines. A Convenient Synthesis of [6- 15N ]-Labeled Adenosines

Sako, Magoichi, Ishikura, Hiroaki, Hirota, Kosaku, Maki, Yoshifumi

Journal:

Nucleosides and Nucleotides

Year:

1994

Language:

english

File:

PDF, 419 KB

english, 1994

30

Mechanistic aspects of the oxidation of 1,3-disubstituted 6-amino-5-nitrosouracils with lead tetraacetate: the formation of pyrimido[5,4-g]pteridinetetrone 10-oxides

Sako, Magoichi, Ohara, Seiji, Hirota, Kosaku, Kano, Keuji, Maki, Yoshifumi, Taylor, Edward C.

Journal:

Journal of Organic Chemistry

Year:

1991

Language:

english

File:

PDF, 631 KB

english, 1991

31

Reductive Cleavage of Heteroaryl C−Halogen Bonds by Iodotrimethylsilane. Facile and Regioselective Dechlorination of Antibiotic Pyrrolnitrin

Sako, Magoichi, Kihara, Toshiyuki, Okada, Katsuyuki, Ohtani, Yasujiro, Kawamoto, Hiromi

Journal:

Journal of Organic Chemistry

Year:

2001

Language:

english

File:

PDF, 50 KB

english, 2001

32

Facile Synthesis and NO-Generating Property of 4 H -[1,2,5]Oxadiazolo[3,4- d ]pyrimidine-5,7-dione 1-Oxides

Sako, Magoichi, Oda, Souichi, Ohara, Seiji, Hirota, Kosaku, Maki, Yoshifumi

Journal:

Journal of Organic Chemistry

Year:

1998

Language:

english

File:

PDF, 65 KB

english, 1998

33

Reactivity of Thioaldehyde: Cyclization Reaction of 6-Amino-1,3-dimethyl-5- thioformyluracil with Enamines into Pyrido[2,3- d ]pyrimidine-2,4-(1 H ,3 H )-diones

Hirota, Kosaku, Kubo, Keiko, Sajiki, Hironao, Kitade, Yukio, Sako, Magoichi, Maki, Yoshifumi

Journal:

Journal of Organic Chemistry

Year:

1997

Language:

english

File:

PDF, 149 KB

english, 1997

34

Photochemical oxygen-atom transfer reaction by heterocycle N-oxides involving a single-electron transfer process: oxidative demethylation of N,N-dimethylaniline

Sako, Magoichi., Shimada, Kaoru., Hirota, Kosaku., Maki, Yoshifumi.

Journal:

Journal of the American Chemical Society

Year:

1986

Language:

english

File:

PDF, 406 KB

english, 1986

35

A Facile Synthetic Method for 15 N 4 -Labeled Cytosine Nucleosides

Sako, Magoichi, Kihara, Toshiyuki, Kawada, Hiroyoshi, Hirota, Kosaku

Journal:

Journal of Organic Chemistry

Year:

1999

Language:

english

File:

PDF, 33 KB

english, 1999

36

Intramolecular Cyclization of Purine Nucleosides by N-Halogenosuccinimides/Acetic Acid. A Mechanistic Aspect on the C(8)-Halogenation of Purine Nucleosides

Maki, Yoshifumi, Sako, Magoichi, Saito, Takao, Hirota, Kosaku

Journal:

Year:

1988

Language:

english

File:

PDF, 114 KB

english, 1988

37

Novel Photodegradation of the Antifungal Antibiotic Pyrrolnitrin in Anhydrous and Aqueous Aprotic Solvents

Sako, Magoichi, Kihara, Toshiyuki, Tanisaki, Mihoko, Maki, Yoshifumi, Miyamae, Akira, Azuma, Toshio, Kohda, Shigetaka, Masugi, Takashi

Journal:

Journal of Organic Chemistry

Year:

2002

Language:

english

File:

PDF, 82 KB

english, 2002

38

Photochemical intramolecular cyclisation of purine and pyrimidine nucleosides induced by an electron acceptor

Sako, Magoichi, Shimada, Kaoru, Hirota, Kosaku, Maki, Yoshifumi

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1986

Language:

english

File:

PDF, 222 KB

english, 1986

39

Photochemical formation and degradation of cephalosporins

Maki, Yoshifumi, Sako, Magoichi

Journal:

Journal of the American Chemical Society

Year:

1977

Language:

english

File:

PDF, 861 KB

english, 1977

40

Facile Synthesis of 7,8-Dimethyl-10-D-Ribitylpyrimido- [5,4-b][1,4]-benzothiazine-2,4(1H,3H)-dione, a Deaza-thia Analog of 1,5-Dihydroriboflavin

Sako, Magoichi, Ichioka, Takahiro, Totani, Reiko, Hirota, Kosaku

Journal:

Journal of Organic Chemistry

Year:

1995

Language:

english

File:

PDF, 296 KB

english, 1995

41

A High Chemical Reactivity of 5-Azidouracils and Its Synthetic Application: Novel Synthesis of 8-Substituted 1,3-Dimethylxanthine Derivatives

Hirota, Kosaku, Sako, Magoichi, Sajiki, Hironao

Journal:

Year:

1997

Language:

english

File:

PDF, 220 KB

english, 1997

42

A Convenient Method for the Preparation of N 2 -Ethylguanine Nucleosides and Nucleotides

Sako, Magoichi, Kawada, Hiroyoshi, Hirota, Kosaku

Journal:

Journal of Organic Chemistry

Year:

1999

Language:

english

File:

PDF, 46 KB

english, 1999

43

A New and Efficient Synthetic Method for 15N 3 -Labeled Cytosine Nucleosides: Dimroth Rearrangement of Cytidine N 3 -Oxides

Sako, Magoichi, Kawada, Hiroyoshi

Journal:

Journal of Organic Chemistry

Year:

2004

Language:

english

File:

PDF, 73 KB

english, 2004

44

Synthesis and Applications of [1- 15 N]-Labeled 4,6-Dimethyl-4 H -[1,2,5]oxadiazolo[3,4- d ]pyrimidine-5,7-dione 1-Oxide as a Useful Tool for Mechanistic Investigations

Sako, Magoichi, Yaekura, Isamu, Oda, Souichi, Hirota, Kosaku

Journal:

Journal of Organic Chemistry

Year:

2000

Language:

english

File:

PDF, 82 KB

english, 2000

45

Photochemical oxygenation of phenols by pyrimido[5,4-g]pteridne N-oxide. Comparative studies with pyridazine and isoalloxazine N-oxides

Sako, Magoichi, Ohara, Seiji, Hirota, Kosaku, Maki, Yoshifumi

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1990

Language:

english

File:

PDF, 797 KB

english, 1990

46

Accelerative effect of N 6-acyl groups on the C(8)-hydrogen exchange of 9-substituted adenines

Maki, Yoshifumi, Suzuki, Mikio, Kameyama, Keiji, Sako, Magoichi

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1981

Language:

english

File:

PDF, 156 KB

english, 1981

47

Regiocontrolled photooxygenation of ibuprofen by pyrimido[5,4-g]pteridinetetrone? and anthraquinone?oxygen systems

Sako, Magoichi, Oyabu, Iwao, Hirota, Kosaku, Maki, Yoshifumi

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1991

Language:

english

File:

PDF, 214 KB

english, 1991

48

Reaction of nucleosides with lead tetra-acetate: facile formation of cyclonucleosides

Kameyama, Keiji, Sako, Magoichi, Hirota, Kosaku, Maki, Yoshifumi

Journal:

Journal of the Chemical Society Chemical Communications

Year:

1984

Language:

english

File:

PDF, 157 KB

english, 1984

49

Synthesis of a novel 5-deaza-5-thia analogue of tetrahydrofolic acid, N-(p-{[(2-amino-6,7-dihydro-4-oxo-3H,8H-pyrimido[5,4-b][1,4]thiazin-6-yl)methyl]amino}benzoyl)glutamic acid

Totani, Reiko, Sako, Magoichi, Hirota, Kosaku, Maki, Yoshifumi

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1994

Language:

english

File:

PDF, 595 KB

english, 1994

50

Reactivity of 10-thiaisoalloxazine. Ring-contraction by water (hydroxide ion) followed by redox reaction

Sako, Magoichi, Totani, Reiko, Niwa, Takashi, Hirota, Kosaku, Maki, Yoshifumi

Journal:

Journal of the Chemical Society Perkin Transactions 1

Year:

1990

Language:

english

File:

PDF, 390 KB

english, 1990

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