The enaminone (4), prepared from (2S)-pyroglutamic acid, has been reacted with Grignard reagents to afford a variety of (E)-alkylidene derivatives (8). Three of these have been converted to the 4-alkylideneglutamic acids, (1), (2) and (3), which are identical to known natural products, (2) and (3) being the E-isomers.
由(2S)-焦谷
氨酸制备的烯胺酮(4)已经与格利雅试剂反应,得到各种(E)-亚烷基衍
生物(8)。这些中的三个已被转化为与已知的
天然产物相同的4-亚烷基谷
氨酸(1),(2)和(3),(2)和(3)是E-异构体。