Stereoselective Syntheses of Alkyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetates in Solvent-Free Conditions, X-Ray Single Crystal Structure Analysis of Ethyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetate
1:1 adducts, which undergo a cyclization reaction to produce alkyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetates, in good yields. The stereochemistry of the ethyl Z-2-(2-amino-4-oxo-1,3- selenazol-5(4H)-ylidene)acetate was established by X-ray single crystal structureanalysis. The reaction is completely stereoselective.
硒脲在无溶剂条件下与乙炔二羧酸二烷基酯反应形成 1:1 加合物,其进行环化反应生成烷基 Z-2-(2-amino-4-oxo-1,3-selenazol-5(4H)-ylidene )醋酸盐,收率良好。Z-2-(2-amino-4-oxo-1,3-selenazol-5(4H)-ylidene) 乙酸乙酯的立体化学是通过 X 射线单晶结构分析建立的。该反应是完全立体选择性的。
One-Pot Stereoselective Synthesis of Alkyl <i>Z</i>-2-[2-Amino-4-oxo-1,3-selenazol-5(4<i>H</i>)-yliden] Acetates
Selenourea reacts with dialkyl acetylenedicarboxylates in acetone to form 1:1 adducts, which undergo a cyclization reaction to produce alkyl Z-2-(2-amino-4-oxo-1,3-selenazol-5(4H)-yliden) acetates in fairly good yields. The reaction is completely stereoselective.