Solvent-Free Synthesis of 2-Amino-5-Aryloxymenthyl1-1,3,4-Thiadiazoles and Their Coumarin or Benzofuran Bis-Heterocyclic Dericatives
摘要:
2-amino-5-aryloxymethyl-1,3,4-thiadiazoles were synthesized rapidly by a microwave-accelerated solvent- free procedure in high yield via the condensation of thiosemicarbazide with aryloxyacetic acids using poly(ethylene glycol)-supported dichlorophosphate as a dehydration reagent. The solvent- free N-acylation of 2-amino-5-aryloxymethyl-1,3,4-thiadiazoles with coumarin-3-carboxylic acid chloride or benzofuran-2-carboxylic acid chloride efficiently afforded corresponding bis-heterocyclic derivatives, 2-(coumarin-3-carboxamido)-5-aryloxymethyl-1,3,4-thiadiazoles, and 2-( benzofuran-2-carboxamido)-5-aryloxymethyl-1,3,4-thiadiazoles. The strategy has advantages of no organic solvent pollution, an elevated reaction rate, an improved yield, and a simple work-up procedure.
One-Pot Synthesis of Phenylallyl Substituted Unsymmetrical Ureas Under Microwave Irradiation
作者:Lan-Qin Chai、Wei-Peng Chen、Xiao-Qiang Wang、Jian-Lin Ge
DOI:10.1080/10426500701407441
日期:2007.9.13
unsymmetrical ureas were synthesized in a one-pot procedure by reactions of cinnamoyl isocyanate, which was prepared from cinnamoyl azide by Curtius rearrangement, with various aromatic amines, 2-amino-5-aryl-1,3,4-thiadiazoles and 2-amino-5-aryloxymethylene-1,3,4-thiadiazoles undermicrowaveirradiation. Compared to conventional methods, this synthesis has the advantages of mild reaction conditions
A NEW ROUTE TO 2-(5-ARYL-2-FUROYLAMIDO)-5-ARYLOXYMETHYL-1,3,4-THIADIAZOLES
作者:Xicun Wang、Zheng Li、Yuxia Da
DOI:10.1081/scc-120003160
日期:2002.1
ABSTRACT The 2-(5-aryl-2-furoylamido)-5-aryloxymethyl-1,3,4-thiadiazoles 4 1–18 are synthesized by the reaction of 5-aryl-2-furoic acids 1 with phenylsulfonyl chloride and 2-amino-5-aryloxymethyl-1,3,4-thiadiazoles 3 under phase transfer catalysis.
2-benzofuryl substituted unsymmetrical ureas were synthesized by reactions of benzofuroyl isocyanate, which was prepared from benzofuroyl azide by Curtiusrearrangement, with various aromatic amines, 2-amino-5-(benzo-2-furyl)-1,3,4-thiadiazole, and 2-amino-5-aryloxymethylene-1,3, 4-thiadiazoles under microwave irradiation. Compared to conventional methods, this synthesis has the advantages of mild reaction
由苯并呋喃酰叠氮化物经库尔提斯重排制备的苯并呋喃酰异氰酸酯与各种芳香胺、2-氨基-5-(苯并-2-呋喃基)-1,3反应合成了一系列2-苯并呋喃基取代的不对称脲, 4-噻二唑和 2-氨基-5-芳氧基亚甲基-1,3, 4-噻二唑在微波辐射下。与常规方法相比,该合成方法具有反应条件温和、易于操作、收率高等优点。产品已通过分析和光谱(IR 和 1 H NMR)数据表征。
SYNTHESIS OF<i>N</i>-(5-ARYLOXYMETHYL-1,3,4-THIADIAZOL-2-YL)-<i>N</i>′-(5-ARYL-2-FUROYL)-THIOUREAS UNDER PHASE TRANSFER CATALYSIS
作者:Xicun Wang、Zheng Li、Ya Tu、Yuxia Da
DOI:10.1081/scc-120003161
日期:2002.1
ABSTRACT The N-(5-aryloxymethyl-1,3,4-thiadiazol-2-yl)-N′-(5-aryl-2-furoyl)-thioureas (41–15 ) are synthesized by the reaction of 5-aryl-2-furoyl chlorides 1 with ammonium thiocyanate and 2-amino-5-aryloxymethyl-1,3,4-thiadiazoles 3 under phasetransfercatalysis.