13137-69-4Relevant academic research and scientific papers
Reactivity of glucosyl radical in the presence of phenols
Alberti, Angelo,Della Bona, Maria A.,Macciantelli, Dante,Pelizzoni, Francesca,Sello, Guido,Torri, Giangiacomo,Vismara, Elena
, p. 10241 - 10248 (1996)
Glucosyl radicals from the photoreaction of α-bromo-2,3,4,6-tetra-O-acetylglucose (ABG) with hexabutylditin react with phenols. 4-H3-COC6H4O· was identified by means of EPR spectroscopy in the case of 4-methoxyphenol, and the corresponding α-O-glucoside was isolated along with 1- and 2-deoxysugars and the dimers of glucosyl radical. The present results are consistent with the formation of α-O-glucosides observed in the electrochemical reaction of ABG and phenols, although in this case the dimers represent the main reaction products.
REDUCTION STEREOSELECTIVE D'HALOGENURES DE GLYCOSYLES PAR LE DEUTERIEURE DE TRIBUTYLETAIN
Praly, Jean-Pierre
, p. 3075 - 3078 (1983)
The reduction of several glycosyl halides by tributyltin deuteride is shown to proceed with a high stereoselectivity, favouring α-attack.
NaBH3CN and other systems as substitutes of tin and silicon hydrides in the light or heat-initiated reduction of halosugars: A tunable access to either 2-deoxy sugars or 1,5-anhydro-itols
Bruyère, Isabelle,Tóth, Zoltan,Benyahia, Hamida,Xue, Jia Lu,Praly, Jean-Pierre
supporting information, p. 9656 - 9662 (2013/10/22)
UV light-promoted reduction of acetobromoglucose by NaBH3CN in t-BuOH afforded 1,3,4,6-tetra-O-acetyl-2-deoxy-α-d-arabino-hexopyranose in high yield and purity, via a Surzur-Tanner rearrangement, while, with 10 mol % thiophenol added, acetylated 1,5-anhydro-d-glucitol was cleanly obtained. Such tin-free and mild reductions, presumed to proceed via radical pathways, were more efficient with NaBH3CN compared to NaBH4 or NaBD 4, and do not occur with acetochloroglucose. Similar reductions to 1,3,4,6-tetra-O-acetyl-2-deoxy-α-d-arabino-hexopyranose were achieved upon heating to 80 C t-BuOH or CH3CN solutions of NaBH3CN and AIBN, but with a lower selectivity due to competing ionic reactions. With other pyranosyl bromides, reductions by NaBH3CN could be tuned similarly (d-galacto), but some (d-manno, 5-thio-d-xylo) gave mainly or exclusively 1,5-anhydro-itols. Other conditions, or reagents promoting SET process, afforded also reduced products, but with lower rates or selectivities. Primary iodides were reduced readily with NaBH3CN under UV light.
Towards α- or β-D-C-glycosyl compounds by tin-catalyzed addition of glycosyl radicals to acrylonitrile and vinylphosphonate, and flexible reduction of tetra-O-acetyl-α-D-glucopyranosyl bromide with cyanoborohydride
Praly, Jean-Pierre,Ardakani, Azin Salek,Bruyere, Isabelle,Marie-Luce, Chrystelle,Bing Qin, Bing
, p. 1623 - 1632 (2007/10/03)
Photo-induced radical addition of acetylated α-D-glucopyranosyl bromide (1) to acrylonitrile or diethyl vinylphosphonate, in the presence of catalytic amounts of tri-n-butyltin chloride and sodium (or tetra-n-butylammonium) cyanoborohydride in excess, all
Development of a catalytic cycle for the generation of C1-glycosyl carbanions with Cp2TiCl2: Application to glycal synthesis
Hansen,Daasbjerg,Skrydstrup
, p. 8645 - 8649 (2007/10/03)
A catalytic cycle has been developed for the conversion of glycosyl halides to their corresponding glycals using Cp2TiCl2. This process can be effectively used with only 30% of the in situ generated single electron reducing agent in contrast to the 2 equivalents normally employed. (C) 2000 Published by Elsevier Science Ltd.
Synthesis of 1,2-trans C-glycosyl compounds by reductive samariation of glycosyl iodides
Miquel,Doisneau,Beau
, p. 2347 - 2348 (2007/10/03)
Reductive samariation of per-O-trimethylsilyl or benzyl glycopyranosyl iodides in the presence of carbonyl compounds provides the corresponding 1,2-trans-C-glycosyl compounds in good yields.
Radical dimerization of glycosyl 2-pyridylsulfones with samarium (II) iodide in the presence of HMPA
Doisneau, Gilles,Beau, Jean-Marie
, p. 3477 - 3480 (2007/10/03)
Reduction of glycosyl 2-pyridylsulfones by samarium (II) iodide in the presence of HMPA leads to glycosyl dimers in up to 74% yield. This is rationalized by a free-radical mechanism.
Zinc-N-base mediated synthesis of pyranoid glycals mechanistic studies
Somsak, Laszlo,Madaj, Janusz,Wisniewski, Andrzej
, p. 1075 - 1087 (2007/10/03)
Reactions of acetobromoglucose 1 or acetylated 1-bromo-D-galactopyranosyl cyanide 3 with zinc dust in the presence of a N-base (1-methylimidazole, 4-methylpyridine, or triethylamine, pyridine, respectively) in ethyl acetate or benzene were efficiently inhibited by 10-30 mol % of 1,4-dinitrobenzene, elemental sulfur, or carbon tetrachloride. Presence of glycosyl radicals in these reactions was also shown by trapping them with tert-dodecyl mercaptan or methyl acrylate. Based on these observations and the high yielding formation of glycal derivatives 2 and 4 of high purity a free radical chain mechanism is proposed for the transformations.
Synthesis of α-(1->2)-, α-(1->3)-, α-(1->4)-, and α-(1->5)-C-Linked Disaccharides through 2,3,4,6-Tetra-O-acetylglucopyranosyl Radical Additions to 3-Methylidene-7-oxabicycloheptan-2-one Derivatives
Bimwala, R. Mampuya,Vogel, Pierre
, p. 2076 - 2083 (2007/10/02)
The "naked sugar" (+)-1 (1R,2S,4R)-2-cyano-7-oxabicyclohept-5-en-2-yl (1S')-camphanate) has been converted into (+)-(1R,4R,5R,6R)-3-methylidene-5-exo,6-exo-(isopropylidenedioxy)-7-oxabicycloheptan-2-one ((+)-3) and (-)-(1S,4R,5R,6R)-5-exo-(b
Free radical-mediated addition of peracetylated 1-bromo-β-D-glucopyranosyl chloride to acrylonitrile
Praly,El Kharraf,Descotes
, p. 117 - 123 (2007/10/02)
Dropwise addition of a benzene solution of tri-n-butylstannane to a solution of 2,3,4,6-tetra-O-acetyl-1-bromo-β-D-glucopyranosyl chloride in boiling benzene containing acrylonitrile in excess led predominantly, under photolytic conditions, to a mixture of nonononitriles, either chlorinated or unsaturated. Dropwise addition of a benzene solution of tri-n butylstannane to a solution of 2,3,4,6-tetra-O- acetyl-1-bromo-β-D-glucopyranosyl chloride in boiling benzene containing acrylonitrile in excess led predominantly, under photolytic conditions, to a mixture of nonononitriles, either chlorinated or unsaturated.
