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Yoshimasa Machida
Researcher at Eisai
Publications - 60
Citations - 221
Yoshimasa Machida is an academic researcher from Eisai. The author has contributed to research in topics: Alkyl & Derivative (chemistry). The author has an hindex of 8, co-authored 60 publications receiving 220 citations.
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A Useful Method for the Dealkylation of Dialkyl Phosphonates
TL;DR: In this article, a very mild and extremely efficient method for the dealkylation of 1 containing labile functional groups was presented, which is the only known method for this purpose, albeit mild, taking several days and the yields are not always satisfactory.
Patent
Biphenylderivatives, process for their preparation and their use as medicaments.
Kozo Akasaka,Masahiro Yonaga,Akiharu Kajiwara,Higurashi Kunizo,Kohshi Ueno,Satoshi Nagato,Makoto Komatsu,Kitazawa Noritaka,Masataka Ueno,Yamanishi Yoshiharu,Yoshimasa Machida,Yuki Komatsu,Naoyuki Shimomura,Norio Minami,Toshikazu Shimizu,Atsushi Nagaoka +15 more
TL;DR: A biphenyl derivative represented by the following formula (I) or a pharmacologically acceptable salt thereof is clinically useful for treating and ameliorating mental disorders such as cerebrovascular disorder, aggressive behavior due to senile dementia, mental excitation, poriomania, delirium, hallucination, hyperkinesia, schizophrenia, emotional disturbance, depression, neurosis, psychophysiologic disorder and anxiety neurosis as discussed by the authors.
Patent
1,4-diazepine derivative and its pharmaceutical use
Kazuo Okano,Shuhei Miyazawa,Richard Clark,Shinya Abe,Tetsuya Kawahara,Naoyuki Shimomura,Osamu Asano,Hiroyuki Yoshimura,Mitsuaki Miyamoto,Yoshinori Sakuma,Kenzo Muramoto,Hiroshi Obaishi,Koukichi Harada,Hajime Tsunoda,Satoshi Katayama,Kouji Yamada,Shigeru Souda,Yoshimasa Machida,Kouichi Katayama,Isao Yamatsu +19 more
TL;DR: A triazolo-1,4-di-azepine compound of the below given formula and a pharmacologically acceptable salt thereof are disclosed and useful in the pharmaceutical field, especially to allergic diseases.
Patent
3-propenylcephem derivative, preparation thereof, chemical intermediates therein, pharmaceutical composition and use
Takashi Kamiya,Toshihiko Naito,Shigeto Negi,Yuuki Komatu,Yasunobu Kai,Takaharu Nakamura,Isao Sugiyama,Yoshimasa Machida,Seiichiro Nomoto,Kyosuke Kitoh,Kanemasa Katsu,Hiroshi Yamauchi +11 more
TL;DR: A 3-propenylcephem derivative of the following formula: as mentioned in this paper, where R 1 represents a fluoro-substituted lower alkyl group and A represents a cyclic or an acylic ammonio group, or a pharmaceutically acceptable salt thereof.
Patent
Novel penicillin and cephalosporin compounds, a process for preparing the same and antibacterial composition containing the novel compounds
Yoshimasa Machida,Isao Saito,Isao Sugiyama,Shigeto Negi,Seiichiro Nomoto,Hironori Ikuta,Hiroshi Yamauchi,Kyosuke Kitoh +7 more
TL;DR: In this paper, a compound represented by the formula: wherein R, is hydrogen or methoxy; R2 is hydrogen, or hydroxy; R is wherein R3 and R4 are hydroxy or acyloxy, Y is oxygen, sulfur, or N-R5 wherein R5 is hydrogen lower alkyl, and Z is sulfur or N -R5 where R5 has the same meanings as defined above; and X is where R6 is acylox or nitrogen-containing hetero-cyclicthio which may have substituent(s),