substrate examined was the diamide of fumaric acid, 2. Hexyl, cyclohexyl, and tert-butyl radical addition to the amide of 4-oxo-2-pentenoic acid (1) gave approximately equal amounts of addition at the carbonyl and amide ends of the alkene. This approach provides the highest reported stereoselectivity for radical addition to an acyclic chiral alkene. Furthermore, a rationale for the diastereoselectivity is
研究的两种烯烃都是
2,5-二甲基吡咯烷的酰胺,可作为来自 D-或
L-丙氨酸的 R,R 或 S,S 对映异构体获得。我们研究的烯烃是衍生自 4-oxo-2-pentenoic 酸 (1) 的不对称单酰胺,而研究的其他底物是
富马酸的二酰胺,2。己基、环己基和叔丁基自由基加成到 4 的酰胺-oxo-2-pentenoic acid (1) 在烯烃的羰基和酰胺末端产生大约等量的加成。这种方法为无环手性烯烃的自由基加成提供了最高的立体选择性。此外,提出了非对映选择性的基本原理,表明酰胺的空间选择性起源并将是普遍的