Title thioureas have been synthesized by reaction of substituted phenylamines with 1,4- or 1,3-benzenedicarbonyl chloride and ammonium thiocyanate by solid-liquid phase transfer catalysis using polyethylene glycol-400...Title thioureas have been synthesized by reaction of substituted phenylamines with 1,4- or 1,3-benzenedicarbonyl chloride and ammonium thiocyanate by solid-liquid phase transfer catalysis using polyethylene glycol-400(PEG-400) as a catalyst in yield of 80%～96%. The compounds were characterized and identified by elemental analysis, IR and 1H NMR.展开更多
Six aromatic acid esters of heptaacetyl maltosyl were synthesized by reaction of hepta-O-acetyl-α-maltosyl bromide with corresponding aromatic acids, using triethyl benzyl ammonium chloride as a phase -transfer catal...Six aromatic acid esters of heptaacetyl maltosyl were synthesized by reaction of hepta-O-acetyl-α-maltosyl bromide with corresponding aromatic acids, using triethyl benzyl ammonium chloride as a phase -transfer catalyst. In the 1 H NMR spectra of these compounds, the che mical shift of C 1 -H in glycosyl-ring appears at downfield, the coupling constant J 1-2 =8 0～8 3. In the IR spectra of the products, the abso r ption of bending vibration of C 1 -H bond in glycosyl-ring appears at abou t 900 cm -1 . The IR, 1 H NMR spectra confirmed their β-anome r configuration. The greater relative abundances of the molecular ion peak were recorded in the mass spectra of the products. The method has advantages of mild reaction conditions, easy separation and high stereospecifi- city of the pro ducts.展开更多
Eight glucoside compounds were synthesized in 41.0-65.9% yields by reaction of 2,3,4,6-era-O-acetyl-α-D-glucopyranosyl bromide with corresponding phenols,using cetyltrimethyl ammonium bromide as a phase-transfer cata...Eight glucoside compounds were synthesized in 41.0-65.9% yields by reaction of 2,3,4,6-era-O-acetyl-α-D-glucopyranosyl bromide with corresponding phenols,using cetyltrimethyl ammonium bromide as a phase-transfer catalyst.In their IR spectra the absorption of bending vibration of C1-H bond in glycosyl-ring appears at about 900cm-1.In their 1H NMR spectra anomeric C1-H appears as a doublet as 5.08-5.14ppm with a coupling constant J1-2=7.8-8.0Hz.All these prove that these glucoside compounds have the configuration of β-anomer.The method has advantages of mild reaction conditions,easy separation and high stereospectificity of the products.展开更多
This paper reports that in the presence of cetyltrimethyl ammonium bromide as phase transfer catalyst,D-glucosamine hydrochloride reacts with 2,4-dinitrophenol to synthesize 1-O-(2’,4’-dinitrophenyl)-2-acetamido-β-...This paper reports that in the presence of cetyltrimethyl ammonium bromide as phase transfer catalyst,D-glucosamine hydrochloride reacts with 2,4-dinitrophenol to synthesize 1-O-(2’,4’-dinitrophenyl)-2-acetamido-β-D-glucoside.Chemical structure of the new compound was confirmed by elemental analysis,IR and UV.展开更多
文摘Title thioureas have been synthesized by reaction of substituted phenylamines with 1,4- or 1,3-benzenedicarbonyl chloride and ammonium thiocyanate by solid-liquid phase transfer catalysis using polyethylene glycol-400(PEG-400) as a catalyst in yield of 80%～96%. The compounds were characterized and identified by elemental analysis, IR and 1H NMR.
文摘Six aromatic acid esters of heptaacetyl maltosyl were synthesized by reaction of hepta-O-acetyl-α-maltosyl bromide with corresponding aromatic acids, using triethyl benzyl ammonium chloride as a phase -transfer catalyst. In the 1 H NMR spectra of these compounds, the che mical shift of C 1 -H in glycosyl-ring appears at downfield, the coupling constant J 1-2 =8 0～8 3. In the IR spectra of the products, the abso r ption of bending vibration of C 1 -H bond in glycosyl-ring appears at abou t 900 cm -1 . The IR, 1 H NMR spectra confirmed their β-anome r configuration. The greater relative abundances of the molecular ion peak were recorded in the mass spectra of the products. The method has advantages of mild reaction conditions, easy separation and high stereospecifi- city of the pro ducts.
文摘Eight glucoside compounds were synthesized in 41.0-65.9% yields by reaction of 2,3,4,6-era-O-acetyl-α-D-glucopyranosyl bromide with corresponding phenols,using cetyltrimethyl ammonium bromide as a phase-transfer catalyst.In their IR spectra the absorption of bending vibration of C1-H bond in glycosyl-ring appears at about 900cm-1.In their 1H NMR spectra anomeric C1-H appears as a doublet as 5.08-5.14ppm with a coupling constant J1-2=7.8-8.0Hz.All these prove that these glucoside compounds have the configuration of β-anomer.The method has advantages of mild reaction conditions,easy separation and high stereospectificity of the products.
文摘This paper reports that in the presence of cetyltrimethyl ammonium bromide as phase transfer catalyst,D-glucosamine hydrochloride reacts with 2,4-dinitrophenol to synthesize 1-O-(2’,4’-dinitrophenyl)-2-acetamido-β-D-glucoside.Chemical structure of the new compound was confirmed by elemental analysis,IR and UV.
