Optimization of methods for the generation of carbodiimides for zwitterionic 1,3-diaza-Claisen rearrangements
作者:Joel D. Walker、José S. Madalengoitia
DOI:10.1016/j.tetlet.2015.04.064
日期:2015.6
Strained, tertiary, allylic, amine 2-benzyl-2-azabicyclo[2.2.1]hept-5-ene reacts with in situ generated carbodiimides in a 1,3-diaza-Claisen rearrangement to afford structurally interesting bicyclic guanidines. Use of more electron deficient carbodiimides makes these rearrangements more facile; however, there are not sufficient methods for the synthesis of highly electron deficient carbodiimides. Herein
应变的叔烯丙基胺2-苄基-2-氮杂双环[2.2.1]庚-5-烯与1,3-二氮杂-克莱森重排的原位生成的碳二亚胺反应,得到结构上有意义的双环胍。使用更多的电子不足的碳二亚胺使这些重排更容易。然而,没有足够的方法来合成高度缺乏电子的碳二亚胺。本文报道了由母体脲和异硫脲合成此类碳二亚胺的探索及其在1,3-二氮杂-克莱森重排中的用途。