Pd(II)-Catalyzed Synthesis of Alicyclic[<i>b</i>]-Fused Pyridines via C(sp<sup>2</sup>)–H Activation of <i>α,β</i>-Unsaturated <i>N</i>-Acetyl Hydrazones with Vinyl Azides
A new synthetic protocol for alicyclic[b]-fused pyridines with complete regioselectivity from α,β-unsaturated N-acetyl hydrazones and vinyl azides via Pd(II)-catalyzed C–H activation/cyclization/aromatization strategy has been described. A series of five- to eight-membered alicyclic[b]-fused pyridines were prepared in a one-step manner with wide substrate scope and good functional group tolerance.
已经描述了一种通过 Pd(II) 催化的 C-H 活化/环化/芳构化策略从α,β-不饱和N-乙酰腙和乙烯基叠氮化物具有完全区域选择性的脂环族[ b ]-稠合吡啶的新合成方案。一步法制备了一系列具有广泛底物范围和良好官能团耐受性的五至八元脂环[ b ]-稠合吡啶。
A Gold-Catalyzed Unique Cycloisomerization of 1,5-Enynes: Efficient Formation of 1-Carboxycyclohexa-1,4-dienes and Carboxyarenes
作者:Shaozhong Wang、Liming Zhang
DOI:10.1021/ja066220f
日期:2006.11.1
A novel Au-catalyzed migratory cycloisomerization strategy is advanced. Implementation of this strategy led to the development of a unique Au-catalyzed 1,5-enyne cycloisomerizatioin involving carboxy migration and Au-mediated C-C single bond formation. 1-Carboxycyclohexa-1,4-dienes and carboxyarenes can be prepared with good efficiency and with flexible substitution patterns.
117. The production of polycyclic aromatic types through the cyclodehydration of unsaturated ketones