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-Claisenrearrangement 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