Search Results - "Kyan, Ryuji"

Late-Stage Derivatization of Oleanolic Acid-Based Anti-HIV-1 Compounds by Takeuchi, Reon, Fujimoto, Junko, Taguchi, Yoshinori, Ide, Ryuji, Kyan, Ryuji, Sato, Kohei, Mase, Nobuyuki, Yokoyama, Masaru, Harada, Shigeyoshi, Narumi, Tetsuo

“…A 12-keto-type oleanolic acid derivative (4) has been identified as a potent anti-human immunodeficiency virus type-1 (HIV-1) compound that demonstrates…”
Get full text

Tuning the Catalyst Reactivity of Imidazolylidene Catalysts through Substituent Effects on the N‑Aryl Groups by Kyan, Ryuji, Sato, Kohei, Mase, Nobuyuki, Watanabe, Naoharu, Narumi, Tetsuo

“…A series of imidazolium salts with various N-aryl groups were synthesized, and their catalytic activities were evaluated to investigate the contribution of the…”
Get full text

Chemoselective Umpolung of Enals for Asymmetric Homoenolate Cross-Annulation of Enals and Aldehydes Catalyzed by N‑Heterocyclic Carbene by Ide, Ryuji, Kyan, Ryuji, Phuc Le, Thien, Kitagawa, Yuya, Sato, Kohei, Mase, Nobuyuki, Narumi, Tetsuo

“…An asymmetric homoenolate cross-annulation of enals and aldehydes with high enantioselectivity is realized by NHC-catalyzed chemoselective umpolung of enals…”
Get full text

Theoretical study to gain fundamental insight into reaction mechanism of N-S acyl transfer of N-sulfanylethylanilide-based protein labeling reagent on protein surface by Shigenaga, Akira, Kyan, Ryuji

“…Elucidation of protein function is one of the central issues in the field of life sciences. To study the function of proteins not in isolation, but in a cell…”
Get full text

Pendant Alkoxy Groups on N‐Aryl Substitutions Drive the Efficiency of Imidazolylidene Catalysts for Homoenolate Annulation from Enal and Aldehyde by Kyan, Ryuji, Sato, Kohei, Mase, Nobuyuki, Narumi, Tetsuo

“…Hydrogen‐transfer in the tetrahedral intermediate generated from an imidazolylidene catalyst and α,β‐unsaturated aldehyde forms a conjugated Breslow…”
Get full text

Residue‐Selective C−H Sulfenylation Enabled by Acid‐Activated S‐Acetamidomethyl Cysteine Sulfoxide with Application to One‐Pot Stapling and Lipidation Sequence by Ohkawachi, Kento, Anzaki, Kaito, Kobayashi, Daishiro, Kyan, Ryuji, Yasuda, Takuma, Denda, Masaya, Harada, Norio, Shigenaga, Akira, Inagaki, Nobuya, Otaka, Akira

“…A tyrosine (Tyr)‐ or tryptophan (Trp)‐selective metal‐free C−H sulfenylation reaction using an acid‐activated S‐acetamidomethyl cysteine (Cys) sulfoxide,…”
Get full text

β,γ-trans-selective γ-butyrolactone formation via homoenolate cross-annulation of enals and aldehydes catalyzed by sterically hindered N-heterocyclic carbene by Kyan, Ryuji, Kitagawa, Yuya, Ide, Ryuji, Sato, Kohei, Mase, Nobuyuki, Narumi, Tetsuo

“…Highly sterically hindered N-heterocyclic carbenes (NHCs), can be readily prepared from the corresponding anilines, and serve as organocatalysts in…”
Get full text

Cover Feature: Residue‐Selective C−H Sulfenylation Enabled by Acid‐Activated S‐Acetamidomethyl Cysteine Sulfoxide with Application to One‐Pot Stapling and Lipidation Sequence (Chem. Eur. J. 26/2023) by Ohkawachi, Kento, Anzaki, Kaito, Kobayashi, Daishiro, Kyan, Ryuji, Yasuda, Takuma, Denda, Masaya, Harada, Norio, Shigenaga, Akira, Inagaki, Nobuya, Otaka, Akira

“…The aromatic (C−H) sulfenylation reaction with S‐acetamidomethyl cysteine sulfoxide (Cys(Acm)(O)) can be Trp‐ or Tyr‐selective under acidic conditions. The red…”
Get full text

Improvement of chemical stability of conjugated dienes by chlorine substitution by Narumi, Tetsuo, Nishizawa, Takuma, Imai, Tomoyuki, Kyan, Ryuji, Taniguchi, Hiroki, Sato, Kohei, Mase, Nobuyuki

“…Conjugated systems have versatile utilities in various fields including organic synthesis, pharmaceutical development, and material science. Such systems take…”
Get full text

Pendant Alkoxy Groups on N‐Aryl Substitutions Drive the Efficiency of Imidazolylidene Catalysts for Homoenolate Annulation from Enal and Aldehyde by Kyan, Ryuji, Sato, Kohei, Mase, Nobuyuki, Narumi, Tetsuo

“…Hydrogen‐transfer in the tetrahedral intermediate generated from an imidazolylidene catalyst and α,β‐unsaturated aldehyde forms a conjugated Breslow…”
Get full text