Synthesis of <i>N</i>-Oxyureas by Substitution and Cope-Type Hydroamination Reactions Using <i>O</i>-Isocyanate Precursors
作者:Meredith A. Allen、Ryan A. Ivanovich、Dilan E. Polat、André M. Beauchemin
DOI:10.1021/acs.orglett.7b03288
日期:2017.12.15
Oxy-carbamate O-isocyanate precursors facilitate access to synthetically valuable N-oxyureas via substitution with amines. This work exploits the reactivity of suitable O-isocyanate precursors, identified by a thorough study highlighting the different reactivity of isocyanate masking groups. This led to bench-stable O-isocyanate precursors, offering improved versatility in the synthesis of N-oxyureas, and
Functionalized imidazolidin‐2‐one were prepared by using an iron‐catalyzed alkeneoxyamination reaction. Hydroxylamine derivatives were used in this atom‐economical process, and the addition of an external oxidant was not required. The conditions developed were shown to be efficient for mono‐, di‐, and trisubstituted double bonds, and a large scope of diamino alcohol precursors were delivered in good
Formation of Complex Hydrazine Derivatives via Aza-Lossen Rearrangement
作者:Dilan E. Polat、David D. Brzezinski、André M. Beauchemin
DOI:10.1021/acs.orglett.9b01742
日期:2019.6.21
The development of a broadly applicable procedure for the aza-Lossen rearrangement is reported. This process converts amines into complexhydrazinederivatives in two steps under safe, mild conditions. This method allows the chemoselective formation of N–N bonds, resulting in the synthesis of cyclic and acyclic products while avoiding side reactions of the amphoteric (ambident) nitrogen-substituted