Partial Cyanoethylation of 2-Tetrahydropyranyl beta-D-Glucopyranosides.
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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 کاملCrystal structure of 6-benzylamino-9-[2-tetrahydropyranyl]-9H-purine.
C17H19O2N5 is monoclinic, P2(1)/n. Unit-cell dimensions at 293 K are a = 10.802(1), b = 24.085(2), c = 12.933(1)A, beta = 106.119(6) degrees, V = 3232.4(6)A3, Dx = 1.271 g/cm3, and Z = 8. The R value is 0.068 for 3017 observed reflections. There are two independent molecules in the asymmetric unit, denoted by A and B. In A, the dihedral angle between the adenine moiety and the phenyl ring is 73...
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 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 کاملPartial Purification and Properties of a beta-d-Glucosyltransferase Occurring in Germinating Phaseolus aureus Seeds.
A soluble enzyme that transfers d-glucose from uridine diphosphate d-glucose to low molecular weight hydroxyl compounds has been discovered in germinating mung bean (Phaseolus aureus) seeds and purified 220-fold. Phenol and n-butyl alcohol are the most reactive aceptors examined. The reactivities of various acceptors are largely independant of hydroxyl group acidities or of the electronic prope...
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ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1964
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.18-0207