The improved synthesis of β-D-glucuronides using TEMPO and t-butyl hypochlorite
作者:Fiona Melvin、Alan McNeill、Peter J.F Henderson、Richard B Herbert
DOI:10.1016/s0040-4039(98)02565-9
日期:1999.2
TEMPO/t-BuOCl is used to oxidise β-D-glucosides to β-D-glucuronides in high yield as a pivotal step in the preparation of labelled glucuronides from labelled glucose samples.
TEMPO / t-BuOCl用于将β-D-葡萄糖苷高产率地氧化为β-D-葡萄糖醛酸苷,这是从标记的葡萄糖样品制备标记的葡萄糖醛酸苷的关键步骤。
Stereochemistry of the hydrolysis of α,α-trehalose by trehalase, determined by using a labelled substrate
times. Equimolecular amounts of α- and β- d -glucopyranose are released simultaneously by the action of the enzyme. This result is consistent with a bimolecular substitution mechanism, taking into account previous results involving C-2 asymmetric participation in the catalytic step of hydrolysis of α,α-trehalose. For comparative evaluation of its accuracy, the usual polarimetric technique was also used
Hydroxide-catalyzed isomerization of d-[1-13C]mannose: Evidence for the involvement of 3,4-enediols
作者:Melinda J. King-Morris、Anthony S. Serianni
DOI:10.1016/s0008-6215(00)90019-3
日期:1986.10
The KOH-catalyzed isomerization of D-[1-13C]mannose under anaerobic conditions was studied by 13C-n.m.r. spectroscopy. D-[1-13C]Glucose and D-[1-13C]fructose are generated during the reaction, as expected. In addition, however, [6-13C]glucose, [6-13C]mannose, and [6-13C]fructose are produced in small proportions, possibly via symmetrical 3,4-enediol intermediates. The involvement of the latter structures in 13C-label shifting is inferred from the observation of [1-13C]sorbose and [6-13C]sorbose in the reaction mixture.
Makkee, M.; Kieboom, A. P. G.; Bekkum, H. van, Recueil des Travaux Chimiques des Pays-Bas, 1984, vol. 103, # 12, p. 361 - 364
作者:Makkee, M.、Kieboom, A. P. G.、Bekkum, H. van
DOI:——
日期:——
KORTH, HANS-GERT;SUSTMANN, REINER;GIESE, BERND;RUCKERT, BRIGITTE;GRONINGE+, CHEM. BER., 123,(1990) N, C. 1891-1898