Comparison of Solid-Phase and Solution-Phase Chiral Auxiliaries in the Alkylation/Iodolactonization Sequence to γ-Butyrolactones
作者:Michael D. Price、Mark J. Kurth、Neil E. Schore
DOI:10.1021/jo0260692
日期:2002.11.1
prolinol-based chiral auxilaries have been compared for the stereoselective synthesis of gamma-butyrolactones via the sequence of N-acylation, C(alpha)()-allylation, and iodolactonization under both solution-phase and solid-phase conditions. Comparisons of stereoselectivity of both the C(alpha)()-allylation and iodolactonization processes indicate that incorporation of a non-C(2)-symmetric auxiliary as a polymer
已经比较了五种基于脯氨醇的手性助剂在溶液相和固相条件下通过N-酰化,Cα()-烯丙基化和碘酸内酯化的顺序进行γ-丁内酯的立体选择性合成。Cα-(烯丙基)化和碘代内酯化过程的立体选择性比较表明,将非C(2)对称助剂作为聚合物交联剂的结合效果优于溶液或其他非聚合方式。 -C(2)-对称助剂,与使用聚合物支持的伪C(2)-对称助剂观察到的相当。