62853-52-5Relevant academic research and scientific papers
Stereoselective mannich-like reactions of ester enolates generated on sugar templates: A novel access to a key intermediate for 1β-methylcarbapenem synthesis
Sasaki, Daisuke,Sawamoto, Daisuke,Takao, Ken-ichi,Tadano, Kin-ichi,Okue, Masayuki,Ajito, Keiichi
, p. 103 - 110 (2008/02/13)
The Mannich-like reactions of the enolates generated from 2,3-di-O-protected 6-deoxy-4-O-propionyl-α-D-glucopyranosides with (3R,4R)-4-acetoxy-3-((R)-1-(t-butyldimethylsilyloxy)ethyl ]azetidin-2-one were investigated. The corresponding 2,3-di-O-methyl derivative provided the Mannich adduct in good to excellent stereoselectivity. From the major adduct, the azetidin-2-one incorporating an α-methyl acetic acid side chain at the C-4 position with ?-configuration was obtained by alkaline hydrolysis. This product, (3S,4S)-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl 1-4-1(R)-1-carboxyethylJazetidin-2-one, is a useful intermediate for the 1 ?-methylcarbapenem synthesis.
Comparative Studies on the Constituents of a Parasitic Plant and Its Host. III. On the Constituents of Boschniakia rossica FEDTSCH, et FLEROV. (2)
Konishi, Tenji,Narumi, Yoko,Watanabe, Kazuaki,Kiyosawa, Shiu,Shoji, Junzo
, p. 4155 - 4161 (2007/10/02)
Two iridoid glucosides, namely boschnaloside (2), (+)-pinoresinol-β-D-glucopyranoside (3), a new oligosaccharide (=β-D-glucopyranosyl(1->4)-α-L-rhamnopyranosyl-(1->3)-D-(4-O-caffeoyl)-glucopyranose) (4), and a new phenylpropanoid glycoside named rossicaside A (5) have been isolated from Boschniakia rossica FEDTSCH, et FLEROV (Orobanchaceae) and their structures have been determined.Keywords--Boschniakia rossica; Orobanchaceae; boschnaloside; boschnaside; (+)-pinoresinol-β-D-glucoside; acetylated oligosaccharide; rossicaside A; phenylpropanoid glycoside
GLYCOSIDES OF MARINE INVERTEBRATES. XV. A NEW TRITERPENE GLYCOSIDE - HOLOTHURIN A1 - FROM CARIBBEAN HOLOTHURIANS OF THE FAMILY HOLOTHURIIDAE
Oleinikova, G. K.,Kuznetsova, T. A.,Ivanova, N. S.,Kalinovskii, A. I.,Rovnykh, N. V.,Elyakov, G. B.
, p. 430 - 434 (2007/10/02)
A glycoside, holothurin A1 has been isolated from the polar glycosidic fractions of the holothurians H. floridana and H. grisea.The complete structure of the glycoside has been established; it is: 3β-3)-O-β-D-glucopyranosyl-(1->4)-O-β-D-quinovopyranosyl-(1->2)-(4-sulfato-β-D-xylopyranosyl)oxy>holosta-9(11)-ene-12α,17α,22ξ-triol.Details of the IR and 1H and 13C NMR spectra of the compounds obtained are given.
