3,4-Dihydropyrimidin-2-(1H)-ones were synthesized in high yields by a one-pot cyclocondensation of aldehyde,1,3-dicarbonyl compound,and urea or thiourea using copper o-toluenesulfonate as a catalyst under solvent-free...3,4-Dihydropyrimidin-2-(1H)-ones were synthesized in high yields by a one-pot cyclocondensation of aldehyde,1,3-dicarbonyl compound,and urea or thiourea using copper o-toluenesulfonate as a catalyst under solvent-free conditions at 90℃.Effects of molar ratio of reactants,amount of catalyst,and reaction temperature on the yields of 3,4-dihydropyrimidin-2-(1H)-ones were investigated.The results showed that at the condition of naldehyde∶n1,3-dicarbonyl compounds∶nurea(or thiourea)=1∶1.2∶1.5,1 mol% catalyst(molar percent of aldehyde),2.0 h at 90℃,the yields of products were 51-96%.After reaction,the catalyst could be reused for four times without distinct loss of catalytic activity.展开更多
The synthesis of an new photochromical compound,1,3,3 trimethyl 6′ (1 piperidinyl) spiro[2h indole 2,3′ [3H]pyridobenzoxazine (SP3),and an improved way for the synthesis of 6 hydroxyquinoline were descrided.The abso...The synthesis of an new photochromical compound,1,3,3 trimethyl 6′ (1 piperidinyl) spiro[2h indole 2,3′ [3H]pyridobenzoxazine (SP3),and an improved way for the synthesis of 6 hydroxyquinoline were descrided.The absorption spectrum of the colored metastable form SP3 shows prominent absorption peak at 560nm at 60℃?展开更多
由1,4-二碘代苯出发,经过两步Sonogashira偶联反应合成标题化合物2-甲基-4-(4-(吡啶-4-乙炔基)苯基)-3-丁炔-2-醇。通过1 H NMR、13 C NMR核磁共振、X射线单晶衍射等手段对化合物的结构进行了表征。结果表明,该化合物属于单斜晶系,空间...由1,4-二碘代苯出发,经过两步Sonogashira偶联反应合成标题化合物2-甲基-4-(4-(吡啶-4-乙炔基)苯基)-3-丁炔-2-醇。通过1 H NMR、13 C NMR核磁共振、X射线单晶衍射等手段对化合物的结构进行了表征。结果表明,该化合物属于单斜晶系,空间群为P2(1)2(1)2(1)。晶体学参数:a=0.060754(15)nm,b=0.081700(19)nm,c=0.32073(7)nm,α=90.00°,β=90.00°,γ=90.00°,V=15.920(7)nm3,Z=8。展开更多
通过水代替有机溶剂来提纯2-丙基-4,5-1 H-咪唑二羧酸二乙酯和4-(1-羟基-1-甲基乙基)-2-丙基-1 H-咪唑-5-羧酸乙酯的新方法,使得改进工艺更加绿色简便。采用1 H NMR、13 C NMR、IR、MS谱图对反应后的产品和未知杂质进行结构鉴定,确证为...通过水代替有机溶剂来提纯2-丙基-4,5-1 H-咪唑二羧酸二乙酯和4-(1-羟基-1-甲基乙基)-2-丙基-1 H-咪唑-5-羧酸乙酯的新方法,使得改进工艺更加绿色简便。采用1 H NMR、13 C NMR、IR、MS谱图对反应后的产品和未知杂质进行结构鉴定,确证为一水合4-(1-羟基-1-甲基乙基)-2-丙基-1 H-咪唑-5-羧酸乙酯和4-乙酰基-2-丙基-1 H-咪唑-5-羧酸乙酯。对反应的可能机理进行初步研究。展开更多
文摘3,4-Dihydropyrimidin-2-(1H)-ones were synthesized in high yields by a one-pot cyclocondensation of aldehyde,1,3-dicarbonyl compound,and urea or thiourea using copper o-toluenesulfonate as a catalyst under solvent-free conditions at 90℃.Effects of molar ratio of reactants,amount of catalyst,and reaction temperature on the yields of 3,4-dihydropyrimidin-2-(1H)-ones were investigated.The results showed that at the condition of naldehyde∶n1,3-dicarbonyl compounds∶nurea(or thiourea)=1∶1.2∶1.5,1 mol% catalyst(molar percent of aldehyde),2.0 h at 90℃,the yields of products were 51-96%.After reaction,the catalyst could be reused for four times without distinct loss of catalytic activity.
文摘The synthesis of an new photochromical compound,1,3,3 trimethyl 6′ (1 piperidinyl) spiro[2h indole 2,3′ [3H]pyridobenzoxazine (SP3),and an improved way for the synthesis of 6 hydroxyquinoline were descrided.The absorption spectrum of the colored metastable form SP3 shows prominent absorption peak at 560nm at 60℃?
文摘由1,4-二碘代苯出发,经过两步Sonogashira偶联反应合成标题化合物2-甲基-4-(4-(吡啶-4-乙炔基)苯基)-3-丁炔-2-醇。通过1 H NMR、13 C NMR核磁共振、X射线单晶衍射等手段对化合物的结构进行了表征。结果表明,该化合物属于单斜晶系,空间群为P2(1)2(1)2(1)。晶体学参数:a=0.060754(15)nm,b=0.081700(19)nm,c=0.32073(7)nm,α=90.00°,β=90.00°,γ=90.00°,V=15.920(7)nm3,Z=8。
文摘通过水代替有机溶剂来提纯2-丙基-4,5-1 H-咪唑二羧酸二乙酯和4-(1-羟基-1-甲基乙基)-2-丙基-1 H-咪唑-5-羧酸乙酯的新方法,使得改进工艺更加绿色简便。采用1 H NMR、13 C NMR、IR、MS谱图对反应后的产品和未知杂质进行结构鉴定,确证为一水合4-(1-羟基-1-甲基乙基)-2-丙基-1 H-咪唑-5-羧酸乙酯和4-乙酰基-2-丙基-1 H-咪唑-5-羧酸乙酯。对反应的可能机理进行初步研究。
