prepared from the corresponding 3-aryl-oxirane-2-carboxylic esters by ring opening with sodium azide, were reduced with tin(II) chloride dihydrate in methanol to give 3-amino-3-aryl-2-hydroxypropanoic esters in good yields. Under these conditions, halogen substituents in the aromatic rings were not affected. The nitro group, however, was partially reduced to the amino group. Treatment of aliphatic oxirane-2-carboxylic
由相应的3-芳基-
环氧乙烷-2-
羧酸酯与
叠氮化
钠开环制备的3-芳基-3-
叠氮基-2-羟基
丙酸酯,在
甲醇中用
氯化锡(II)
二水合物还原,得到3-
氨基-3-芳基-2-羟基
丙酸酯产率高。在这些条件下,芳环中的卤素取代基不受影响。然而,硝基部分还原为
氨基。在
三氟化硼醚化物的存在下用
乙腈处理脂肪族
环氧乙烷-2-
羧酸酯会导致区域特异性形成2,4-二烷基-2-
恶唑啉-5-
羧酸酯,这是由于腈在C3处的反应所致。这些
恶唑啉-5-
羧酸酯的酸性
水解得到相应的3-(酰基
氨基)-2-羟基
羧酸酯。通过这两种互补的方法,