Total synthesis of newbouldine via reductive N–N bond formation
作者:Michael Pangerl、Chambers C. Hughes、Dirk Trauner
DOI:10.1016/j.tet.2010.05.085
日期:2010.8
The first total synthesis of newbouldine has been achieved employing a new, reductiveN–Nbond forming reaction. The asymmetric synthesis confirms that the natural product is a racemate.
An Fe(III)-catalyzed intramolecular N-N coupling of aliphatic azidoamines that forms diverse five-and six-membered semisaturated diazoheterocycles using air as an oxidant is reported, providing an alternative to hydrazine-based methods. Mechanistic studies suggest that a N-radical induced intramolecular homolytic substitution (S(H)2) is involved in ring closure. The power of this N-N bond-forming method is also demonstrated by using it as the final step in a total synthesis of (-)-newbouldine.