1,3-Dipolar addition of the nitronic ester 1 to methyl acrylate and methyl crotonate afforded the corresponding adducts, 2 and 6, respectively. These were converted to the 4-amino-2-hydroxybutyric acids, 5 and 8.
1,3-双极加成反应中,
硝酸酯1与
丙烯酸甲酯和甲基克罗通酸反应,得到相应的加成物2和6。这些加成物转化为4-
氨基-2-羟基
丁酸5和8。