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Masa Katayanagi

Toho University

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Chemical & Pharmaceutical Bulletin | 1977

Photo-oxidative Cyclization of Morusin

Taro Nomura; Toshio Fukai; Sachiko Yamada; Masa Katayanagi

When a solution of morusin (I) in CHCl3 or benzene was exposed to bright sunshine, or irradiated with a high-pressure mercury lamp, morusin hydroperoxide (III) was obtained in a high yield. The reduction of III gave compound A (II) which had been isolated from the root bark of Morus alba L. The reaction mechanism of the photooxidation was discussed based on the several experimental results.

Chemical & Pharmaceutical Bulletin | 1978

Studies on the Constituents of the Cultivated Mulberry Tree. I. Three New Prenylflavones from the Root Bark of Morus alba L.

Taro Nomura; Toshio Fukai; Sachiko Yamada; Masa Katayanagi

Chemical & Pharmaceutical Bulletin | 1978

Studies on the Constituents of the Cultivated Mulberry Tree. III. Isolation of Four New Flavones, Kuwanon A, B, C and Oxydihydromorusin from the Root Bark of Morus alba L.

Taro Nomura; Toshio Fukai; Masa Katayanagi

Chemical & Pharmaceutical Bulletin | 1976

Phenolic Constituents of the Cultivated Mulberry Tree (Morus alba L.)

Taro Nomura; Toshio Fukai; Sachiko Yamada; Masa Katayanagi

Chemical & Pharmaceutical Bulletin | 1977

Kuwanon A, B, C and Oxydihydromorusin, Four New Flavones from the Root Bark of the Cultivated Mulberry Tree (Morus alba L.)

Taro Nomura; Toshio Fukai; Masa Katayanagi

Chemical & Pharmaceutical Bulletin | 1978

Studies on the Constituents of the Cultivated Mulberry Tree. II. Photo-oxidative Cyclization of Morusin

Taro Nomura; Toshio Fukai; Sachiko Yamada; Masa Katayanagi

Heterocycles | 1978

Kuwanon D, New Isoprenoid Flavanone from the Root Bark of the Cultivated Mulberry Tree (Morus Alba L.)

Taro Nomura; Toshio Fukai; Masa Katayanagi

ChemInform | 1977

OXIDATIVE CYCLIZATION OF MORUSIN WITH MANGANESE DIOXIDE

Taro Nomura; Toshio Fukai; Masa Katayanagi

Chemical & Pharmaceutical Bulletin | 1986

A New Spectrophotometric Method for the Determination of Chlorine-Containing Organic Compounds Using 1, 5-Bis(6-methyl-4-pyrimidyl)carbazone

Hideaki Ichiba; Muneo Morishita; Masa Katayanagi; Takehiko Yajima

Bunseki Kagaku | 1986

Application of steam carrier gas chromatography to analyses of pharmaceuticals11114 II. Determination of methyl salicylate, menthol and camphor in medicated spirits in the Japanese Pharmacopoeia X.

Hideaki Iizuka; Muneo Morishita; Masa Katayanagi; Takehiko Yajima

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