Aminoalkyl-Substituted α-Methylene-γ-butyrolactones from α-Amino Acids Using an Indium-Mediated Barbier Allyl Addition
作者:Steffen Steurer、Joachim Podlech
DOI:10.1002/(sici)1099-0690(199907)1999:7<1551::aid-ejoc1551>3.0.co;2-8
日期:1999.7
The indium-mediated reaction of Z-protected α-amino aldehydes 1–6 with 2-(bromomethyl)acrylates 8/9 in aqueous solvents has been investigated. The preference for the formation of syn-configured homoallyl alcohols 10–16 (diastereoselectivities ranging from 2:1 to 32:1, yields 68–93%) may be explained by a chelate-controlled reaction. No racemization occurred during the preparation and transformation
Z-保护的α氨基醛的铟-介导的反应1 - 6与2-(溴甲基)丙烯酸酯8 / 9在水性溶剂中进行了研究。可以通过螯合物控制的反应来解释偏爱形成顺式配置的烯丙基醇10 – 16(非对映选择性范围为2:1至32:1,收率68–93%)。在氨基醛的制备和转化过程中未发生外消旋作用。酸催化的酯化反应(在Et 2 O中为H 2 SO 4)导致α-亚甲基-γ-丁内酯17 – 22产率从89%到97%不等。通过五个X射线晶体学分析和NMR谱图的比较,确定了所有非对映异构体的构型。