Osamu Muraoka

Overview

Best Publications

• Salacinol, potent antidiabetic principle with unique thiosugar sulfonium sulfate structure from the ayurvedic traditional medicine Salacia reticulata in Sri Lanka and India

  Masayuki Yoshikawa;Toshiyuki Murakami;Hiromi Shimada;Hisashi Matsuda

  374
  Citations

• Absolute Stereostructure of Potent α-Glucosidase Inhibitor, Salacinol, with Unique Thiosugar Sulfonium Sulfate Inner Salt Structure from Salacia reticulata

  Masayuki Yoshikawa;Toshio Morikawa;Hisashi Matsuda;Genzoh Tanabe

  307
  Citations

• Di-tert-butylsilylene (DTBS) group-directed α-selective galactosylation unaffected by C-2 participating functionalities

  Akihiro Imamura;Hiromune Ando;Satomi Korogi;Genzoh Tanabe

  215
  Citations

• Acylated phenylethanoid oligoglycosides with hepatoprotective activity from the desert plant Cistanche tubulosa.

  Toshio Morikawa;Yingni Pan;Yingni Pan;Kiyofumi Ninomiya;Katsuya Imura

  147
  Citations

• Phenylethanoid oligoglycosides and acylated oligosugars with vasorelaxant activity from Cistanche tubulosa.

  Masayuki Yoshikawa;Hisashi Matsuda;Toshio Morikawa;Toshio Morikawa;Haihui Xie

  126
  Citations

• Alkaloid constituents from flower buds and leaves of sacred lotus (Nelumbo nucifera, Nymphaeaceae) with melanogenesis inhibitory activity in B16 melanoma cells

  Seikou Nakamura;Souichi Nakashima;Genzo Tanabe;Yoshimi Oda

  118
  Citations

• Salaprionol and Ponkoranol with Thiosugar Sulfonium Sulfate Structure from Salacia prinoides and a-Glucosidase Inhibitory Activity of Ponkoranol and Kotalanol Desulfate

  Masayuki Yoshikawa;Fengming Xu;Seikou Nakamura;Tao Wang

  106
  Citations

• Isolation, structure identification and SAR studies on thiosugar sulfonium salts, neosalaprinol and neoponkoranol, as potent α-glucosidase inhibitors.

  Weijia Xie;Genzoh Tanabe;Junji Akaki;Toshio Morikawa

  100
  Citations

• Biological evaluation of de-O-sulfonated analogs of salacinol, the role of sulfate anion in the side chain on the α-glucosidase inhibitory activity

  Genzoh Tanabe;Kazuya Yoshikai;Takanori Hatanaka;Mizuho Yamamoto

  99
  Citations

• Absolute stereostructures of novel norcadinane- and trinoreudesmane-type sesquiterpenes with nitric oxide production inhibitory activity from Alpinia oxyphylla.

  Osamu Muraoka;Manabu Fujimoto;Genzoh Tanabe;Michinori Kubo

  97
  Citations

• Acylated phenylethanoid glycosides, echinacoside and acteoside from Cistanche tubulosa, improve glucose tolerance in mice

  Toshio Morikawa;Kiyofumi Ninomiya;Mio Imamura;Junji Akaki

  95
  Citations

• Hepatoprotective triterpenes from traditional Tibetan medicine Potentilla anserina.

  Toshio Morikawa;Kiyofumi Ninomiya;Katsuya Imura;Takahiro Yamaguchi

  93
  Citations

• On the structure of the bioactive constituent from ayurvedic medicine Salacia reticulata: revision of the literature

  Osamu Muraoka;Weijia Xie;Genzoh Tanabe;Mumen F.A. Amer

  90
  Citations

• Oleanane-type triterpene oligoglycosides with pancreatic lipase inhibitory activity from the pericarps of Sapindus rarak

  Toshio Morikawa;Yuanyuan Xie;Yuanyuan Xie;Yasunobu Asao;Masaki Okamoto

  89
  Citations

• Inhibitors of Nitric Oxide Production from the Rhizomes of Alpinia galanga: Structures of New 8–9′ Linked Neolignans and Sesquineolignan

  Toshio Morikawa;Shin Ando;Hisashi Matsuda;Shinya Kataoka

  88
  Citations

• Bioactive constituents from Chinese natural medicines. XXII. Absolute structures of new megastigmane glycosides, sedumosides E1, E2, E3, F1, F2, and G, from Sedum sarmentosum (Crassulaceae).

  Toshio Morikawa;Toshio Morikawa;Yi Zhang;Seikou Nakamura;Hisashi Matsuda

  82
  Citations

• Monoterpene constituents from Cistanche tubulosa--chemical structures of kankanosides A-E and kankanol-.

  Haihui Xie;Toshio Morikawa;Toshio Morikawa;Hisashi Matsuda;Seikou Nakamura

  82
  Citations

• Total synthesis of (+/-)-stemonamide and (+/-)-isostemonamide using a radical cascade.

  Tsuyoshi Taniguchi;Genzo Tanabe;Osamu Muraoka;Hiroyuki Ishibashi

  82
  Citations

• Bioactive constituents from Chinese natural medicines. XXIII. Absolute structures of new megastigmane glycosides, sedumosides A(4), A(5), A(6), H, and I, and hepatoprotective megastigmanes from Sedum sarmentosum.

  Kiyofumi Ninomiya;Kiyofumi Ninomiya;Toshio Morikawa;Toshio Morikawa;Yi Zhang;Seikou Nakamura

  81
  Citations

• 7-endo selective aryl radical cyclization onto enamides leading to 3-benzazepines: concise construction of a cephalotaxine skeleton.

  Tsuyoshi Taniguchi;Atsuko Ishita;Masahiko Uchiyama;Osamu Tamura

  79
  Citations

• Synthesis and biological evaluation of deoxy salacinols, the role of polar substituents in the side chain on the α-glucosidase inhibitory activity

  Osamu Muraoka;Kazuya Yoshikai;Hideo Takahashi;Toshie Minematsu

  77
  Citations

• Bioactive Saponins and Glycosides. XXVIII. New Triterpene Saponins, Foliatheasaponins I, II, III, IV, and V, from Tencha (the Leaves of Camellia sinensis)

  Toshio Morikawa;Toshio Morikawa;Seikou Nakamura;Yasuyo Kato;Osamu Muraoka

  77
  Citations