A growth and expansion strategy: A Ni/P(p‐tol)3‐catalyzed cycloaddition of 1,3‐dienes with 3‐azetidinones and 3‐oxetanones produced eight‐membered heterocycles with a variety of substituents (see scheme; Boc=tert‐butoxycarbonyl). The synthesis of the reduced azocine and oxocine derivatives involved the challenging steps of C(sp2)C(sp3) bond activation and C(sp3)C(sp3) reductive elimination.
生长和扩张策略:Ni/P( p -tol) 3催化 1,3-二烯与 3-氮杂
环丁酮和
3-氧杂环丁酮的环加成反应产生带有各种取代基的八元杂环(参见方案;Boc= tert -丁氧基羰基)。还原的氮佐辛和奥佐辛衍
生物的合成涉及C(sp 2 ) C(sp 3 ) 键激活和C(sp 3 ) C(sp 3 ) 还原消除的挑战性步骤。