Synthesis and Aza-[2,3]-Wittig Rearrangements of Vinylaziridines: Scope and Limitations
作者:Jens Åhman、Tomas Jarevång、Peter Somfai
DOI:10.1021/jo9612638
日期:1996.11.15
cis- and trans-2,3-Trisubstituted vinylaziridines have been prepared from cis- and trans-epoxy alcohols, respectively, and used as substrates in the aza-[2,3]-Wittig rearrangement. Five different anion-stabilizing groups have been investigated for their efficiency to promote the rearrangement, and it was found that N-tert-butyl acetyl vinylaziridines were superior in this reaction, affording the corresponding
顺式和反式2,3-三取代的乙烯基氮丙啶分别由顺式和反式环氧醇制备,并用作氮杂[2,3]-维蒂希重排的底物。研究了五个不同的阴离子稳定基团促进重排的效率,发现该反应中N-叔丁基乙酰基乙烯基氮丙啶更优,可提供相应的cis-2,6-四氢吡啶(> 90%)用LDA处理时作为单一异构体。类似地,相应的(Z)-丙烯基氮丙啶给出唯一的反式,反式-2,3,6-三取代四氢吡啶,而(E)-丙烯基氮丙啶以同样高的选择性提供顺式,顺式-2,3,6-衍生物。已经通过改变衬底的结构研究了该方法的范围和局限性,并在一定程度上探讨了重排的机理。机械图比以前假设的要复杂。