Patents by Inventor Yusuke Yukimoto

Yusuke Yukimoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Selective dehalogenation process
    Patent number: 5780669
    Abstract: A compound represented by the following formula (1) or (3): ##STR1## is subjected to a catalytic hydrogenolysis reaction in the presence of a base and thus a compound represented by the following formula (2): ##STR2## wherein R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms and X represents a chlorine atom or a bromine atom;is easily produced. This compound is usable as an intermediate for the preparation of drugs.
    Type: Grant
    Filed: February 1, 1996
    Date of Patent: July 14, 1998
    Assignee: Daiichi Pharmaceutical Co., Ltd.
    Inventors: Toshifumi Akiba, Takanobu Ikeya, Hirofumi Kawanishi, Yusuke Yukimoto, Shinji Kamihara, Tsutomu Ebata
  • Process for producing 2-fluorocyclopropancecarboxlic acid
    Patent number: 5770767
    Abstract: A process for producing a 2-fluorocyclopropane-carboxylic acid of formula ?I! ##STR1## by reducing a 2-halo-2-fluorocyclopropanecarboxylic acid of formula ?II! ##STR2## the reduction being carried out by developing a Raney nickel alloy in the presence of the 2-halo-2-fluorocyclo-propanecarboxylic acid of formula ?II!, or by contacting the 2-halo-2-fluorocyclopropanecarboxylic acid of formula ?II! with hydrogen in an aqueous solvent using a Raney nickel catalyst.
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: June 23, 1998
    Assignees: Sumitomo Chemical Company Limited., Daiichi Pharmaceutical Co., Ltd.
    Inventors: Nobushige Itaya, Ryuhei Wakita, Asako Kubo, Mikio Sasaki, Takashi Namba, Yusuke Yukimoto
  • Crystals of antimicrobial compound
    Patent number: 5693814
    Abstract: A method for selectively obtaining any one of an anhydrate, a 1/2 hydrate, a 1 hydrate, and a 3/2 hydrate of 7-?(7-(S)-amino-5-azaspiro?2.4!heptan-5-yl!-8-chloro-6-fluoro-1-?(1R,2S)-2 -fluorocyclopropyl!-4-oxo-1,4-dihydroquinoline-3-carboxylic acid is disclosed, comprising treating the compound in an aqueous solvent or water or recrystallizing the compound from an aqueous solvent or water.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: December 2, 1997
    Assignee: Daiichi Pharmaceutical Co., Ltd.
    Inventors: Youichi Kimura, Katsuhiro Kawakami, Norimasa Mikata, Keiji Uchiyama, Tazuo Uemura, Yusuke Yukimoto