Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Yaeko Konda"'
Autor:
Shiho Arima, Chiharu Okada, Toshitsugu Kai, Kiminari Yoshida, Yasuyuki Umeda, Yaeko Konda-Yamada, Yoshihiro Harigaya, Noriko Sato, Hiroaki Takayanagi
Publikováno v:
Tetrahedron. 58:7851-7861
Compounds 7′ and 6′-bromo- d -tryptophan ( 1 and 2 ) which are important derivatives for the synthesis of the chloropeptin and kistamycin A, respectively, were conveniently synthesized by optical resolution from N-acetyl-7′ and 6′-bromo- dl -
Autor:
Yoshihiro Harigaya, Yukihiro Takahashi, Kazuyoshi Takeda, Shiho Arima, Masanori Baba, Noriko Sato, Kazuyuki Dobashi, Yaeko Konda
Publikováno v:
Tetrahedron. 57:4311-4321
Mer-N5075A (1) and α-MAPI and β-MAPI (2 and 3) produced from a species of Streptomyces are new anomalous tetrapeptides having potential HIV-I protease inhibitory activity. The first total synthesis of 1 and a diastereomeric mixture of 2 and 3 was a
Publikováno v:
Synthetic Communications. 30:187-200
Neat formic acid alone efficiently N-formylates carbazoles, 3-alkylindoles, diphenylamine and even moderately weak nucleophilic anilines to furnish the corresponding N-formyl derivatives in 72--87% yields.
Autor:
Kazuyoshi Takeda, Yoshihiro Harigaya, Masataka Sakayanagi, Ami Kusunoki, Masataka Dodo, Yaeko Konda, Kaori Tsushima, Noriko Sato, Takahiro Sato
Publikováno v:
Tetrahedron. 55:12723-12740
Methyl and tert -butyl ( E -)-(pyrrolidin-2-ylidene)glycinates 3a and 3b were efficiently and stereoselectively synthesized from 2, 3, 5-tri- O -benzylarabinose using Horner-Emmons olefination of arabinal 9 and phosphorylglycine ester and intramolecu
Publikováno v:
Tetrahedron Letters. 40:6289-6292
Cyclic tripeptides containing a diphenylether bond of the Chloropeptin left-hand segment were synthesized with the use of TTN phenolic oxidation in high yield. They were found to exist as equilibrium mixtures of two stable conformers caused by a rota
Publikováno v:
Carbohydrate Research. 301:123-143
Neohancosides A (1) and B (2) are monoterpene diglycosides isolated from Cynanchum hancockianum , which is a Chinese folk medicine having antitumor activity. First total synthesis of 1 and 2 , (3 R )-linaloyl and (3 R )-8-hydroxylinaloyl 3- O - β -d
Autor:
Kazuyoshi Takeda, Shihomi Takahata, Shiho Arima, Tsuneyuki Toida, Yoshihiro Harigaya, Eisuke Kaji, Yaeko Konda, Yayoi Iwasaki
Publikováno v:
Chemical and Pharmaceutical Bulletin. 45:626-630
Neohancoside C (1) is a new phenol glycoside isolated from Cynanchum hancockianum, which is a Chinese folk medicine having antitumor activity. The synthesis of 1, 2-acetylphenyl β-D-xylopyranosyl-(1→6)-β-D-glucopyranoside, was achieved by phase-t
Publikováno v:
Tetrahedron Letters. 37:4015-4018
First total synthesis of monoterpene diglycosides, neohancosides A ( 1 ) and B ( 2 ) from Cynanchum hancockianum were achieved stereoselectively using fluoride as a glycosyl donor. The absolute configurations of 1 and 2 were determined by enzymatic d
Autor:
Yoshihisa Mizuno, Yoshihiro Harigaya, Hiroko Nakamura, Eisuke Kaji, Yaeko Konda, Kazuyoshi Takeda, Akira Akiyama, Hiroaki Takayanagi
Publikováno v:
Synthesis. 1996:341-348
Autor:
Yoshihiro Harigaya, Hitoshi Kagawa, Xue-Long Sun, Hiroaki Takayanagi, Masayuki Onda, Xian Li, Yaeko Konda, Tomomitsu Sasaki
Publikováno v:
Journal of Heterocyclic Chemistry. 32:1531-1535
Two biflavones isolated from Taxus cuspidata were identified with ginkgetin (1) and sciadopitysin (2) which belong to C3′-C8 connected biflavones. The conformation of 2 in the solid state was determined by X-ray analysis and the conformations of 1