Facile direct synthesis of unsymmetrical ureas from N-Alloc-, N-Cbz-, and N-Boc-protected amines using DABAL-Me3
作者:Soosung Kang、Hee-Kwon Kim
DOI:10.1016/j.tet.2018.06.011
日期:2018.7
A practical synthetic method for the direct synthesis of unsymmetrically substituted ureas from N-Alloc-, N-Cbz-, and N-Boc-protected amines is described. In this study, efficient direct conversion of the Alloc-, Cbz-, and Boc-carbamate compounds to ureas was achieved in the presence of DABAL-Me3, an air stable and easily handled reagent. Using this reaction method, both protected aromatic and aliphatic
描述了一种由N -Alloc-,N -Cbz-和N -Boc保护的胺直接合成不对称取代的脲的实用合成方法。在这项研究中,在DABAL-Me 3(一种空气稳定且易于处理的试剂)的存在下,将Alloc-,Cbz-和Boc-氨基甲酸酯化合物有效地直接转化为尿素。使用这种反应方法,受保护的芳族胺和脂族胺都可以成功地转化为各种三取代和四取代的脲,而无需副产物即可获得高收率。我们的发现为从N -Alloc-,N -Cbz-和N -Boc-氨基甲酸酯直接制备有用的尿素提供了有希望的指导。