由2,3,4,6-四-O-乙酰-α-D-D-吡喃葡萄糖溴化物(A)和芳香酸合成1-O-芳酰-β-D-吡喃葡萄糖2,3,4,6-四乙酸酯(1～7)。产物的构型由 IR 和~1HNMR 测定。2,3,4,6-四-O-苄基-α-D-吡喃葡萄糖(B)和芳香酰氯缩合反应的产物为1-O-芳酰-2,3,4,6-...由2,3,4,6-四-O-乙酰-α-D-D-吡喃葡萄糖溴化物(A)和芳香酸合成1-O-芳酰-β-D-吡喃葡萄糖2,3,4,6-四乙酸酯(1～7)。产物的构型由 IR 和~1HNMR 测定。2,3,4,6-四-O-苄基-α-D-吡喃葡萄糖(B)和芳香酰氯缩合反应的产物为1-O-芳酰-2,3,4,6-四-O-苄基-D-吡喃葡萄糖α-体和β-体的混合物,其中α组分占优势。展开更多
Nine compounds, aristolochic acid (1), aristolochic acid Ⅱ(2), aristolochic acid Ⅲ a(3), aristoloside (4), aristolactam N β D glucoside (5), aristolactam β D glucoside (6), tuberosinone (7), tuberosinone N β D gl...Nine compounds, aristolochic acid (1), aristolochic acid Ⅱ(2), aristolochic acid Ⅲ a(3), aristoloside (4), aristolactam N β D glucoside (5), aristolactam β D glucoside (6), tuberosinone (7), tuberosinone N β D glucoside (8) and 6 O p coumaroyl D glucopyranose (9), were isolated from methanol extracts of fresh roots of Aristolochia cinnabarina. Among them, compound 9 was reported in Aristolochiaceae for the first time.展开更多
2acetylamino3,4,6triacetate Dglucopyranose is an important imtermediate in the synthesis of Lipid A analogs.It was synthesized by the regioselective 1Odeacylation of fully acylated sugars.In this paper, ...2acetylamino3,4,6triacetate Dglucopyranose is an important imtermediate in the synthesis of Lipid A analogs.It was synthesized by the regioselective 1Odeacylation of fully acylated sugars.In this paper, the fully acylated aminoglucose was synthesized by a new method.In comparison with the old procedure,the reaction time was shorten ed,yet the yield was still higher.展开更多
l-O-Aroyl-β-D-glucopyranose tetraacetates (Ⅰ -Ⅶ) were obtained by the condensation of tetra-O-acetyl-α-ZJ-glucopyranosyl bromide with aromatic acids in K2CO3-Me2CO at room temperature. Exclusive production of β-D...l-O-Aroyl-β-D-glucopyranose tetraacetates (Ⅰ -Ⅶ) were obtained by the condensation of tetra-O-acetyl-α-ZJ-glucopyranosyl bromide with aromatic acids in K2CO3-Me2CO at room temperature. Exclusive production of β-D-anomers was confirmed by measurement of their specific rotation and also by observing their 1R and NMR spectra. Reaction of α-acetobromoglucose with methyl o- or p-hydroxybenzoate in aq. KOH-Me2CO gives the corresponding β-D-glucopyranoside(Ⅶ- Ⅷ). Control of the stereochemistry in obtaining α-D-anomers (Ⅷ-Ⅸ ) could also be satisfactorily achieved by employing penta-O-acetyl-D-glucopyranose and methyl o- or p- hydroxybenzoate in ZnG2-AcOH-Ac2O.展开更多
文摘由2,3,4,6-四-O-乙酰-α-D-D-吡喃葡萄糖溴化物(A)和芳香酸合成1-O-芳酰-β-D-吡喃葡萄糖2,3,4,6-四乙酸酯(1～7)。产物的构型由 IR 和~1HNMR 测定。2,3,4,6-四-O-苄基-α-D-吡喃葡萄糖(B)和芳香酰氯缩合反应的产物为1-O-芳酰-2,3,4,6-四-O-苄基-D-吡喃葡萄糖α-体和β-体的混合物,其中α组分占优势。
文摘Nine compounds, aristolochic acid (1), aristolochic acid Ⅱ(2), aristolochic acid Ⅲ a(3), aristoloside (4), aristolactam N β D glucoside (5), aristolactam β D glucoside (6), tuberosinone (7), tuberosinone N β D glucoside (8) and 6 O p coumaroyl D glucopyranose (9), were isolated from methanol extracts of fresh roots of Aristolochia cinnabarina. Among them, compound 9 was reported in Aristolochiaceae for the first time.
文摘2acetylamino3,4,6triacetate Dglucopyranose is an important imtermediate in the synthesis of Lipid A analogs.It was synthesized by the regioselective 1Odeacylation of fully acylated sugars.In this paper, the fully acylated aminoglucose was synthesized by a new method.In comparison with the old procedure,the reaction time was shorten ed,yet the yield was still higher.
文摘l-O-Aroyl-β-D-glucopyranose tetraacetates (Ⅰ -Ⅶ) were obtained by the condensation of tetra-O-acetyl-α-ZJ-glucopyranosyl bromide with aromatic acids in K2CO3-Me2CO at room temperature. Exclusive production of β-D-anomers was confirmed by measurement of their specific rotation and also by observing their 1R and NMR spectra. Reaction of α-acetobromoglucose with methyl o- or p-hydroxybenzoate in aq. KOH-Me2CO gives the corresponding β-D-glucopyranoside(Ⅶ- Ⅷ). Control of the stereochemistry in obtaining α-D-anomers (Ⅷ-Ⅸ ) could also be satisfactorily achieved by employing penta-O-acetyl-D-glucopyranose and methyl o- or p- hydroxybenzoate in ZnG2-AcOH-Ac2O.
