Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Emiko Shioya"'
Publikováno v:
ChemInform. 23
We have succeeded in developing a novel glycosidation catalyzed by a combination of trimethylsilyl bromide (TMSBr) and a Lewis acid using simple O-glycosides as glycosyl donors. Treatment of benzyl 2-deozy-2-tri-chloroethoxycarbonylamino-D-glucopyran
Publikováno v:
ChemInform. 22
A Novel stereoselective glycosidation was achieved by the combined use of trityl halide and Lewis acid under mild reaction conditions. The stereoselectivity was found to be drastically changed by the presence of trityl halide.
Publikováno v:
ChemInform. 23
Publikováno v:
ChemInform. 22
A novel glycoside anomerization occurred when trimethylsilyl bromide (TMSBr) and zinc bromide were utilized in combination as a catalyst. Treatment of β-glycosides with TMSBr and zinc bromide in the presence of alcohols afforded anomerized products
Autor:
Kiyoshi Nakayama, Emiko Shioya, Y. Osada, Tsunehiko Soga, Tsuneo Kusama, Shoichi Kusumoto, Y. Ono, H. Nakajima, Tetsuo Shiba
Publikováno v:
ChemInform. 22
Publikováno v:
Chemical and Pharmaceutical Bulletin. 39:2502-2504
A novel direct transformation of O-glycoside into glycosyl bromide by using trimethylsilyl bromide and zinc bromide has been developed. Treatment of various glycosides (3a-5a, 10, 12 and 14) with trimethylsilyl bromide and zinc bromide in dichloromet
Publikováno v:
Chemical and Pharmaceutical Bulletin. 39:590-592
A novel glycoside anomerization occurred when trimethylsilyl bromide (TMSBr) and zinc bromide were utilized in combination as a catalyst. Treatment of β-glycosides with TMSBr and zinc bromide in the presence of alcohols afforded anomerized products
Publikováno v:
Chemical and Pharmaceutical Bulletin. 38:3280-3282
A Novel stereoselective glycosidation was achieved by the combined use of trityl halide and Lewis acid under mild reaction conditions. The stereoselectivity was found to be drastically changed by the presence of trityl halide.
Autor:
Tsuneo Kusama, Tsunehiko Soga, Emiko Shioya, Yasuaki Osada, Yashiyuki Ono, Kiyoshi Nakayama, Eiji Kumazawa, Uoto Kouichi
Publikováno v:
Chemicalpharmaceutical bulletin. 39(12)
Six novel lipid A analogs were synthesized. The first two analogs, 4 and 5, have an alpha-glycosidically bound carboxymethyl or 1,3-dicarboxyisopropyl group on the disaccharide backbone with four tetradecanoyl groups. The next three analogs, 6, 7 and
Autor:
Shoichi Kusumoto, Eiji Kumazawa, Emiko Shioya, Yoshiyuki Ono, Yasuaki Osada, Tsuneo Kusama, Tsunehiko Soga, Tetsuo Shiba
Publikováno v:
Chemicalpharmaceutical bulletin. 39(8)
Two novel analogs of a biosynthetic precursor of lipid A (2) were synthesized. The one analog (3) has acyl groups identical to those of 2, and the other (4) has tetradecanoyl groups in place of the (R)-3-hydroxytetradecanoyl groups of 2. Both 3 and 4