以对氨基水杨酸为起始原料,经过甲基化、硫氰化、还原乙基化、氧化、水解得到4-氨基-5-乙磺酰基-2-甲氧基苯甲酸。探讨了甲基化反应和硫乙基引入方法问题,并对各步反应合成条件进行了优化。改进后工艺总收率达55%,目标化合物和各中间体...以对氨基水杨酸为起始原料,经过甲基化、硫氰化、还原乙基化、氧化、水解得到4-氨基-5-乙磺酰基-2-甲氧基苯甲酸。探讨了甲基化反应和硫乙基引入方法问题,并对各步反应合成条件进行了优化。改进后工艺总收率达55%,目标化合物和各中间体经IR,1 H NMR和MS等确证结构。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
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
2Amino1,2,3,4,6Opentaacetyl glucopyranose was synthesized from glucosamine hydrochloride,acetic hydride and triethylamine with thick sulfur acid as a catalyst.Under optimum reaction conditions,glucosamine hy...2Amino1,2,3,4,6Opentaacetyl glucopyranose was synthesized from glucosamine hydrochloride,acetic hydride and triethylamine with thick sulfur acid as a catalyst.Under optimum reaction conditions,glucosamine hydrochloride,acetic hydrideand triethylamine reacted in at 60°C for 3h to give the goal product in 852% yield.Its structure was confirmed by H1NMR and elemental analysis.展开更多
以4-硝基氟苯为原料,经芳环溴代、亲核取代、硝基还原,共3步反应制得2-溴-4-氨基苯甲醚。考察了反应物用量、反应温度和反应时间对溴酸钠溴代法收率的影响,考察了3种还原法对还原收率的影响。当n(4-硝基氟苯)∶n(硫酸钾)=50∶1,反应温度...以4-硝基氟苯为原料,经芳环溴代、亲核取代、硝基还原,共3步反应制得2-溴-4-氨基苯甲醚。考察了反应物用量、反应温度和反应时间对溴酸钠溴代法收率的影响,考察了3种还原法对还原收率的影响。当n(4-硝基氟苯)∶n(硫酸钾)=50∶1,反应温度为68℃,反应时间为3h时,溴代反应收率为69.6%;以10%Pd-C/甲酸铵还原硝基时,反应收率为92.3%;3步反应的总收率为61.0%。各步产物结构均经MS、1 H NMR进行表征。展开更多
The title compound 3 was synthesized from diethylguanidine nitrate（2） obtained from diethylamine, CaCN2 and HNO3. The mixture consisted of 0.5 mol 2, 0.55 mol acetonyl propionate, 3 g benzyltriethylammonium chloride...The title compound 3 was synthesized from diethylguanidine nitrate（2） obtained from diethylamine, CaCN2 and HNO3. The mixture consisted of 0.5 mol 2, 0.55 mol acetonyl propionate, 3 g benzyltriethylammonium chloride, and 44 g NaOH was refluxed for 4 hours to give 85 g 3, in yield 94.6%.展开更多
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.
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2Amino1,2,3,4,6Opentaacetyl glucopyranose was synthesized from glucosamine hydrochloride,acetic hydride and triethylamine with thick sulfur acid as a catalyst.Under optimum reaction conditions,glucosamine hydrochloride,acetic hydrideand triethylamine reacted in at 60°C for 3h to give the goal product in 852% yield.Its structure was confirmed by H1NMR and elemental analysis.
文摘以4-硝基氟苯为原料,经芳环溴代、亲核取代、硝基还原,共3步反应制得2-溴-4-氨基苯甲醚。考察了反应物用量、反应温度和反应时间对溴酸钠溴代法收率的影响,考察了3种还原法对还原收率的影响。当n(4-硝基氟苯)∶n(硫酸钾)=50∶1,反应温度为68℃,反应时间为3h时,溴代反应收率为69.6%;以10%Pd-C/甲酸铵还原硝基时,反应收率为92.3%;3步反应的总收率为61.0%。各步产物结构均经MS、1 H NMR进行表征。
文摘The title compound 3 was synthesized from diethylguanidine nitrate（2） obtained from diethylamine, CaCN2 and HNO3. The mixture consisted of 0.5 mol 2, 0.55 mol acetonyl propionate, 3 g benzyltriethylammonium chloride, and 44 g NaOH was refluxed for 4 hours to give 85 g 3, in yield 94.6%.
