Rhodium(I)-Catalyzed Allenic Carbocyclization Reaction Affording δ- and ε-Lactams
作者:Kay M. Brummond、Thomas O. Painter、Donald A. Probst、Branko Mitasev
DOI:10.1021/ol062842u
日期:2007.1.1
This letter extends the scope of the rhodium(I)-catalyzed allenic Alder-ene carbocyclization reaction to the preparation of delta- and epsilon-lactams from amides. A variety of allenic propiolamides were cycloisomerized to give a number of unsaturated delta-lactams. In addition, allenic propargylamides give good yields of the corresponding epsilon-lactams. Formation of lactams possessing these ring
这封信将铑(I)催化的烯丙基Alder-ene碳环化反应的范围扩展到由酰胺制备δ-和ε-内酰胺。将多种烯丙丙酰胺进行环异构化,得到许多不饱和的δ-内酰胺。另外,烯丙炔丙基酰胺给出相应的ε-内酰胺的良好产率。具有这些环尺寸的内酰胺的形成很少通过过渡金属催化的碳-碳键形成策略来完成。因此,该方法提供了一种用于合成这些子结构的替代策略。[反应:请参见文字]。