The Preparation of 2-Tetrahydropyranyl beta-D-Glucopyranosides and Methyl 4-O-(2-Tetrahydropyranyl)-beta-D-Glucopyranosides.
نویسندگان
چکیده
منابع مشابه
Borate esters of the methyl D-glucopyranosides.
Methyl alpha- and beta-D-glucopyranoside act as moderate chelators of a boron centre through their O-4/6 binding site whereas the trans/trans arrangement of the O-2/3/4 hydroxy functions is not suited to form a chelate with the small boron central atom. In this work we report the crystal structure of the bisdiolatoborate Na2[B(Me alpha-D-Glcp4,6H(-2))(Me alpha-D-Glcp3,4,6H(-3))].NaOH.8H2O (1) a...
متن کاملEffect of base concentration upon the reactivities of the hydroxyl groups in methyl D-glucopyranosides.
The anomeric methyl D-glucopyranosides were treated with NJV-diethylaziridinium chloride in various molarities of aqueous sodium hydroxide at variable ionic strength and constant ionic strength. It was found that the extent of reaction of the hydroxyl groups at C-2, C-3, and C-4 decreased with increasing concentration of base. Reaction at the C-6 hydroxyl group remained essentially constant wit...
متن کاملDisorder and conformational analysis of methyl [beta]-d-galactopyranosyl-(1-->4)-[beta]-d-xylopyranoside
Methyl -d-galactopyranosyl-(1!4)-d-xylopyranoside, C12H22O10, (II), crystallizes as colorless needles from water with positional disorder in the xylopyranosyl (Xyl) ring and no water molecules in the unit cell. The internal glycosidic linkage conformation in (II) is characterized by a ’0 torsion angle (C2Gal—C1 0 Gal—O1 0 Gal—C4Xyl) of 156.4 (5) and a 0 torsion angle (C1Gal—O1 0 Gal—C4Xyl—C3Xyl...
متن کاملMicrotropins J-P: 6’-O-(2”S,3”R)-2”-Ethyl-2”,3”-Dihydroxybutyrates of Phenolic Alcohol ß-D-Glucopyranosides from the Branches of Microtropis japonica
From the branches of Microtropis japonica (Celastraceae), seven phenolic alcohol glucosides, named microtropins J-P (1-7), were isolated. The 6-position of glucose was esterified with 2-ethyl-2,3-dihydroxybutyric acid. Microtropin K (2) was hydrolyzed under a mild basic condition to give methyl (2S,3R)-2-ethyl-2,3-dihydroxybutyrate, whose absolute structure was determined by the comparison of N...
متن کاملUtilization and metabolism of [U-14C]4' galactosyllactose (O-beta-D-galactopyranosyl-(1----4)-O-beta-D-galactopyranosyl-(1----4)- D-glucopyranose) in rats.
O-beta-D-Galactopyranosyl-(1----4)-O-beta-D-galactopyranosyl- (1----4)-D-glucopyranose (designated as 4'GL) are produced from lactose with Cryptococcus laurentii OKN-4. Excretion and metabolism of 4'GL in rats were examined using a radioisotope technique. [U-14c]4'GL was synthesized from [U-14C]lactose by Cryptococcus laurentii OKN-4. The 14CO2 in expired air was counted after oral administrati...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1962
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.16-0623