Addition reaction of benzylbenzylidenenamine to lithium enolates of 1,3-dioxolan-4-one: synthesis of 2-phenylisoserines
作者:Lizbeth Juárez-Guerra、Susana Rojas-Lima、Heraclio López-Ruiz
DOI:10.3998/ark.5550190.0012.926
日期:——
The synthesis of two new 2-phenylisoserines, each bearing a quaternary stereocenter is described. These compounds, which are analogs of the amino acid side chain found in taxol and taxotere, were obtained by addition of the lithium enolates of (2S,5S)-2-isopropyl-5-phenyl-1,3dioxolan-4-one and (2S,5S)-2-tert-butyl-2-methyl-5-phenyl-1,3-dioxolan-4-one to benzylbenzylideneamine in the presence of BF3
描述了两个新的 2-苯基异丝氨酸的合成,每个都带有一个四元立体中心。这些化合物是在紫杉醇和紫杉酚中发现的氨基酸侧链的类似物,是通过添加 (2S,5S)-2-异丙基-5-苯基-1,3dioxolan-4-one 和( 2S,5S)-2-叔丁基-2-甲基-5-苯基-1,3-dioxolan-4-one 在 BF3 存在下转化为苄基亚苄基胺。O(Et)2。在每种情况下分离非对映体混合物,并通过X-射线分析确定其绝对构型。