Degradation of N,N′-dialkyldiazenedicarboxamides with a copper(II) reagent, which was prepared from lithium 4-nitrophenoxide and copper(II) bromide in tetrahydrofuran, proceeded via formation of isocyanate to produce the corresponding 4-nitrophenyl N-alkylcarbamate with the evolution of nitrogen. Further, it was also found that 4-nitrophenyl N-alkylcarbamate reacted with primary or secondary amines
MUNTEAN, IOAN;HERDAN, JEAN MICHEL;VALEANU, GABRIELA, REV. ROUM. CHIM., 33,(1988) N 5, C. 467-471
作者:MUNTEAN, IOAN、HERDAN, JEAN MICHEL、VALEANU, GABRIELA
DOI:——
日期:——
US7320993B1
申请人:——
公开号:US7320993B1
公开(公告)日:2008-01-22
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