Metal-Free Stereoselective Synthesis of (<i>E</i>)- and (<i>Z</i>)-N-Monosubstituted β-Aminoacrylates via Condensation Reactions of Carbamates
作者:Scott R. Pollack、Amélie Dion
DOI:10.1021/acs.joc.1c01212
日期:2021.9.3
acids and pharmaceuticals. Two efficient, stereoselective methods of preparation, via acid- or base-promoted condensation reactions of carbamates, are described. The base-promoted reaction is E-selective, while acid catalysis can, through the choice of solvent, selectively form E or Z. The acid-catalyzed E-selective process proceeds through a crystallization obviating the need for chromatographic purification
N-单取代的 β-氨基丙烯酸酯是结构单元,已用于制备氨基酸和药物。描述了两种有效的立体选择性制备方法,通过酸或碱促进的氨基甲酸酯缩合反应。碱促进的反应是E选择性的,而酸催化可以通过溶剂的选择选择性地形成E或Z。酸催化的E选择性过程通过结晶进行,无需色谱纯化。