Koichi Koga

Revolutionary phosgene‐free synthesis of α‐amino acid <i>N</i>‐carboxyanhydrides using diphenyl carbonate based on activation of α‐amino acids by converting into imidazolium salts

Koichi Koga, Atsushi Sudo, Takeshi Endo · Journal of Polymer Science Part A Polymer Chemistry · 2010 · 48 citations

α-Amino Acid N-carboxyanhydrides, α‐Amino Acids, Engineering +13

NMR Study of Weak Antiferromagnetism in NbFe₂

Yoshihiro Yamada, Hiroyuki Nakamura, Yoshio Kitaoka et al. · Journal of the Physical Society of Japan · 1990 · 43 citations

Magnetic Properties, Engineering, Magnetic Resonance +16

Phosgene‐free synthesis of <i>N</i>‐carboxyanhydrides of α‐amino acids based on bisarylcarbonates as starting compounds

Yukihiro Fujita, Koichi Koga, Hyun‐Kyoung Kim et al. · Journal of Polymer Science Part A Polymer Chemistry · 2007 · 43 citations · Full text

Combinatorial Chemistry, α‐Amino Acids, Engineering +12

Phosgene‐free synthesis of polypeptides: Useful synthesis for hydrophobic polypeptides through polycondensation of activated urethane derivatives of α‐amino acids

Shuhei Yamada, Koichi Koga, Atsushi Sudo et al. · Journal of Polymer Science Part A Polymer Chemistry · 2013 · 41 citations

Bioorganic Chemistry, Engineering, Urethane Derivatives +18

Useful synthetic method of polypeptides with well‐defined structure by polymerization of activated urethane derivatives of α‐amino acids

Shuhei Yamada, Koichi Koga, Takeshi Endo · Journal of Polymer Science Part A Polymer Chemistry · 2012 · 39 citations

Engineering, Urethane Derivatives, Peptide Engineering +18