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
Photolysis of Ethyl Azidoformate in Ethers and in Alcohols
作者:Noboru Torimoto、Tadao Shingaki、Toshikazu Nagai
DOI:10.1246/bcsj.50.1517
日期:1977.6
Ethoxycarbonyl nitrene, generated by the photolysis of ethyl azidoformate (I), was inserted preferentially into the α C–H bonds of acyclic ethers. Each of the reactions with acyclic ethers gave N-alkoxyurethane via a cleavage of the C–O bond, indicating that an O–N ylide is an intermediate of the nitrene reaction. Comparing sensitized photolysis with direct photolysis of I in ethers and in alcohols, it was