Search Results - "Kitajima, Mariko"

Recent studies on chemical constituents of Ophiorrhiza plants by Kitajima, Mariko

“…Ophiorrhiza plants (Family Rubiaceae) are known to produce diverse monoterpenoid indole alkaloids including camptothecin with potent antitumor activity. This…”
Get full text

Enantioselective Total Syntheses of (−)-Silicine and (−)-20-Episilicine by Ataka, Yoshihiro, Kitajima, Mariko, Ishikawa, Hayato

“…The enantioselective total syntheses of (−)-silicine and (−)-20-episilicine, which contain a chiral piperidine with three contiguous chiral centers (D-ring)…”
Get full text

Total Syntheses of (+)‐Villocarine A, (−)‐Apogeissoschizine, and (+)‐Geissoschizine by Sakamoto, Jukiya, Kitajima, Mariko, Ishikawa, Hayato

“…Total syntheses of geissoschizine‐type monoterpenoid indole alkaloids (MTIAs) are reported. An intramolecular Pictet‐Spengler cyclization was developed for the…”
Get full text

Total Syntheses of Pleiocarpamine, Normavacurine, and C‑Mavacurine by Sato, Keigo, Kogure, Noriyuki, Kitajima, Mariko, Takayama, Hiromitsu

“…The total syntheses of C-mavacurine-type indole alkaloids, (±)-pleiocarpamine, (±)-normavacurine, and (±)-C-mavacurine, were accomplished. The key step in the…”
Get full text

Cover Feature: Total Syntheses of (+)‐Villocarine A, (−)‐Apogeissoschizine, and (+)‐Geissoschizine (Chem. Eur. J. 18/2023) by Sakamoto, Jukiya, Kitajima, Mariko, Ishikawa, Hayato

“…Geissoschizine is a very important biosynthetic intermediate of monoterpenoid alkaloids in higher plants. In this study, the enantioselective and…”
Get full text

Asymmetric Total Syntheses of Mitragynine, Speciogynine, and 7-Hydroxymitragynine by Sakamoto, Jukiya, Kitajima, Mariko, Ishikawa, Hayato

“…A number of alkaloids found in Mitragyna species belonging to the Rubiaceae family have been shown to have potent biological activity such as analgesic…”
Get full text

Asymmetric Total Synthesis of Fawcettimine-Type Lycopodium Alkaloid, Lycopoclavamine‑A by Kaneko, Hiroki, Takahashi, Shunsuke, Kogure, Noriyuki, Kitajima, Mariko, Takayama, Hiromitsu

“…An asymmetric total synthesis of lycopoclavamine-A (1), a structurally unique fawcettimine-type Lycopodium alkaloid, was achieved via a stereoselective…”
Get full text

Bioinspired Total Synthesis of (+)-Kopsiyunnanine B by Imaoka, Sho, Nakashima, Yuta, Kitajima, Mariko, Ishikawa, Hayato

“…The first enantioselective total synthesis of kopsiyunnanine B, which has a unique folded and complex pentacyclic structure containing six contiguous chiral…”
Get full text

Asymmetric Total Synthesis of a Pentacyclic Lycopodium Alkaloid: Huperzine-Q by Nakayama, Atsushi, Kogure, Noriyuki, Kitajima, Mariko, Takayama, Hiromitsu

“…Right on Q: The first asymmetric total synthesis of (−)‐huperzine‐Q, which possesses six stereogenic centers and a spiroaminal moiety, has been achieved in 19…”
Get full text

Asymmetric Total Synthesis of Sarpagine-Related Indole Alkaloids Hydroxygardnerine, Hydroxygardnutine, Gardnerine, (E)‑16-epi-Normacusine B, and Koumine by Kitajima, Mariko, Watanabe, Keisuke, Maeda, Hiroyuki, Kogure, Noriyuki, Takayama, Hiromitsu

“…Sarpagine-related indole alkaloids (−)-hydroxygardnerine, (+)-hydroxygardnutine, (−)-gardnerine, (+)-(E)-16-epi-normacusine B, and (−)-koumine were divergently…”
Get full text

Asymmetric Total Synthesis and Evaluation of Antitumor Activity of Ophiorrhisine A and Its Derivatives by Onozawa, Tadayoshi, Kitajima, Mariko, Kogure, Noriyuki, Takayama, Hiromitsu

“…The first asymmetric total synthesis of ophiorrhisine A (1), a new cyclic tetrapeptide isolated from Ophiorrhiza nutans, was accomplished via an intramolecular…”
Get full text

Asymmetric Total Synthesis and Structure Elucidation of Huperzine H by Shiomi, Shinya, Wilailak, Kaewsri, Soutome, Wataru, Takayama, Hiromitsu, Kitajima, Mariko, Ishikawa, Hayato

“…A first asymmetric total synthesis of huperzine H has been achieved in a 12% overall yield from commercially available (+)-pulegone. The key steps of this…”
Get full text

Biogenetically Inspired Total Syntheses of Lycopodium Alkaloids, (+)-Flabellidine and (−)-Lycodine by Azuma, Masayuki, Yoshikawa, Tetsuya, Kogure, Noriyuki, Kitajima, Mariko, Takayama, Hiromitsu

“…The first asymmetric total synthesis of (+)-flabellidine (2) and the shortest total synthesis of (−)-lycodine (3) were accomplished by a strategy featuring the…”
Get full text

flavonoid 3‐O‐glucoside:2″‐O‐glucosyltransferase responsible for terminal modification of pollen‐specific flavonols in Arabidopsis thaliana by Yonekura‐Sakakibara, Keiko, Nakabayashi, Ryo, Sugawara, Satoko, Tohge, Takayuki, Ito, Takuya, Koyanagi, Misuzu, Kitajima, Mariko, Takayama, Hiromitsu, Saito, Kazuki

“…Flavonol 3‐O‐diglucosides with a 1→2 inter‐glycosidic linkage are representative pollen‐specific flavonols that are widely distributed in plants, but their…”
Get full text

Concise asymmetric total synthesis of lycopodine and flabelliformine via cascade cyclization reaction by Wada, Kentaro, Kogure, Noriyuki, Kitajima, Mariko, Takayama, Hiromitsu

“…[Display omitted] •The shortest-step asymmetric total synthesis of lycopodine was accomplished.•The first asymmetric synthesis of flabelliformine was…”
Get full text

Total synthesis of conolidine and apparicine by Takanashi, Noriyuki, Suzuki, Kenta, Kitajima, Mariko, Takayama, Hiromitsu

“…[Display omitted] A total synthesis of indole alkaloids, (±)-conolidine and (±)-apparicine, was accomplished via a gold(I)-catalyzed 6-exo-dig cyclization to…”
Get full text

Asymmetric Total Synthesis of Pentacyclic Indole Alkaloid Andranginine and Absolute Configuration of Natural Product Isolated from Kopsia arborea by Tooriyama, Shino, Mimori, Yuji, Wu, Yuqiu, Kogure, Noriyuki, Kitajima, Mariko, Takayama, Hiromitsu

“…The first asymmetric total synthesis of andranginine (1) via an asymmetric Morita–Baylis–Hillman reaction and a diastereoselective intramolecular Diels–Alder…”
Get full text

Synthetic study of biphenylquinolizidine alkaloids I. Asymmetric total synthesis of lasubine I featuring organocatalyzed asymmetric intramolecular aza-Michael addition by Hirama, Taku, Umemura, Takayuki, Kogure, Noriyuki, Kitajima, Mariko, Takayama, Hiromitsu

“…[Display omitted] •An organocatalyzed asymmetric intramolecular aza-Michael addition of linear dienone was developed.•A new synthetic method of chiral…”
Get full text

Asymmetric Total Synthesis of Biphenylquinolizidine Alkaloids 4″‑O‑Demethyllythridine and 14-epi-4″‑O‑Demethyllythridine by Kawabata, Haruka, Hirama, Taku, Yanagisawa, Tomomi, Sato, Keigo, Kogure, Noriyuki, Kitajima, Mariko, Takayama, Hiromitsu

“…The first asymmetric total synthesis of new biphenylquinolizidine alkaloids 4″-O-demethyllythridine and 14-epi-4″-O-demethyllythridine isolated from Heimia…”
Get full text

New Lycopodine-Type Alkaloids from Lycopodium carinatum by Kogure, Noriyuki, Maruyama, Moe, Wongseripipatana, Sumphan, Kitajima, Mariko, Takayama, Hiromitsu

“…The structures of new lycopodine-type alkaloids, lycopocarinamines A–F, which were isolated from Lycopodium carinatum, were elucidated by spectroscopic…”
Get full text