Preparation of N-protected allylic amines and α-methylene-β-amino acids from vinylalumination/Baylis–Hillman products via tandem SN2′ substitution–Overman rearrangement
作者:P. Veeraraghavan Ramachandran、Thomas E. Burghardt、M. Venkat Ram Reddy
DOI:10.1016/j.tetlet.2005.01.110
日期:2005.3
reaction on the acetates obtained from vinylalumination or Baylis–Hillman products, followed by in situ reduction afforded allylic alcohols. Upon conversion to trichloroacetimidates and [3,3]-sigmatropic rearrangement, the corresponding N-protected β-substituted allylic amines were obtained in good yields. Utilization of hydroxy group as the nucleophile furnished allylic hydroxy esters, which were converted
S N 2'对由乙烯基铝化或Baylis-Hillman产品获得的乙酸盐进行反应,然后原位还原得到烯丙醇。在转化为三氯乙亚氨酸酯和[3,3]-σ重排后,以良好的产率获得了相应的N-保护的β-取代的烯丙基胺。利用羟基作为亲核试剂提供的烯丙基羟基酯,其通过超人重排转化为受保护的α-亚甲基-β-氨基酸。