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1)  Paal-Knorr condensation
Paal-Knorr缩合
1.
Synthesis of N-carboalkyloxy-2,5-dimethylpyrroles by the Paal-Knorr condensation of carbamate with diketone;
Paal-Knorr缩合法合成N-烷氧羰基-2,5-二甲基吡咯
2.
Paal-Knorr condensation of hexane-2,5-dione with primary amines was successfully carried out at room temperature under solvent- and catalyst-free conditions.
本文报道了无需使用任何催化剂和溶剂,在室温条件下多种胺(包括脂肪胺、芳香胺)和2,5-己二酮发生Paal-Knorr缩合反应,且合成的吡咯衍生物产率较高。
2)  Paal-Knorr reaction
Paal-Knorr反应
1.
Six 2,5 -diphenyl furan,thiophene and pyrrole derivatives were synthesized from substituted acetophenone by bromination,Aldol condensation and Paal-Knorr reaction.
以取代基苯乙酮为原料,经溴代、羟醛缩合、Paal-Knorr反应制得6个2,5-二苯基呋喃、噻吩、吡咯衍生物,总收率为20。
3)  Knorr condensation
Knorr缩合
1.
The synthesis of B-C-semichlorin was prepared with ring B which has Alpha position vacancy and ring C which has Alpha position linked with the formacyl under the alkalinity condition,ring B building block was produced with diethyl oxalacetate and aminoacetone through the Knorr condensation,then by way of decarboxyl and the oxidation,the total yield of ring B was 20.
其中B环结构单元是由草酰乙酸二乙酯与氨基丙酮通过Knorr缩合生成2-羧基-3-乙氧羰基-4-甲基吡咯,再经由脱羧和氧化得到,该环总收率为20。
4)  Koenigs-Knorr condensation reaction
Koenip-Knorr缩合反应
5)  Knorr cyclization
Knorr环化
1.
Ethyl 5(3)-(4-methoxyphenyl)-1H-pyrazole-3(5)carboxylate were synthesized through Claisen condensation,Knorr cyclization with 1-(4-methoxyphenyl)ethanone and diethyl oxalate as the starting materials.
以4-甲氧基苯乙酮和草酸二乙酯为起始原料,通过Claisen酯缩合、Knorr环化得到3(5)-(4-甲氧基苯基)-1H-5(3)-吡唑甲酸乙酯,再与水合肼反应得到3(5)-(4-甲氧基苯基)-1H-5(3)-吡唑酰肼,进一步与芳香缩合,高产率合成出10个新的3(5)-(4-甲氧基苯基)-1H-5(3)-取代吡唑酰腙化合物,通过元素分析、红外光谱、核磁共振氢谱等测试手段对所合成的10个新化合物进行了结构表征。
6)  Kenigs-Knorr reaction
Kenigs-Knorr反应
补充资料:Knorr-paal pyrrole synthesis
分子式:
CAS号:

性质:也称克诺尔-帕尔吡咯合成(Knorr-paal pyrrole synthesis)。指 1,4-二羰基化合物与氨或伯胺缩合形成吡咯化合物的反应。其中R和R`可以是烷基、-OH、-CH2CO2H-NH2以及NHC6H5等基团,这是合成吡咯类最常用的反应之一。

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