isobutyric anhydride in the presence of 10 mol % of a C2-symmetric chiral 4-pyrrolidinopyridine catalyst (1) at -50 degrees C gave the 4-O-isobutyryl derivative as the sole product in 98% yield. Thus, chemoselective acylation, favoring a secondaryhydroxylgroup in the presence of a free primary hydroxylgroup, and regioselective acylation, favoring one of three secondaryhydroxylgroups, took place
Exploring the meaning of sugar configuration in a supramolecular environment: comparison of six octyl glycoside micelles by ITC and NMR spectroscopy
作者:Jörn Schmidt-Lassen、Thisbe K. Lindhorst
DOI:10.1039/c4md00122b
日期:——
glycomicelles were determined by isothermal titration calorimetry (ITC) and diffusion NMR studies. The goal of this work was to determine the significance of anomeric configuration as well as of epimerisation at the sugar ring for supramolecular features of the respective glycoside. A new projection of glycoside structures is proposed to facilitate interpretation of structure–property relationships in this
Novel Selectivity in Carbohydrate Reactions, IV: DABCO-Mediated Regioselective Primary Hydroxyl Protection of Carbohydrates
作者:Bharat Kacheshwar Gadakh、Premanand Ramrao Patil、Satish Malik、K. P. Ravindranathan Kartha
DOI:10.1080/00397910802656067
日期:2009.6.9
Abstract An efficient procedure for the regioselective tritylation of primaryhydroxylgroup of aldohexopyranosides and nucleosides using trityl chloride in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO) in dichloromethane has been developed. Subsequent acetylation of the tritylated products in the same pot has been made possible, thereby providing an efficient route to the fully protected carbohydrate
A polymer stabilizer comprising the following alkoxy compound:
the alkoxy compound: a compound obtained by alkoxylating at least one hydroxyl group contained in a compound of the following formula (1) containing one formyl group or carbonyl group and (n−
1
) hydroxyl groups in the molecule with an alkyl group having 1 to 12 carbon atoms:
C
n
H
2n
O
n
(1)
(wherein, n represents an integer of 3 or more).