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
作者:W. S. Rapson、R. G. Shuttleworth
DOI:10.1039/jr9400000636
日期:——
Ruthenium-catalysed synthesis of chiral exocyclic allylic alcohols <i>via</i> chemoselective transfer hydrogenation of 2-arylidene cycloalkanones
exclusive asymmetric reduction of CO bonds of 2-arylidene four-, five-, six-, and seven-membered cycloalkanones has been studied systematically. The asymmetric transfer hydrogenation was performed using a robust and commercially available chiral diamine-derived ruthenium complex as a catalyst and HCOOH/Et3N as a hydrogen source under mild conditions, giving 51 examples of chiral exocyclic allylic alcohols
已经系统地研究了2-芳基四,五,六和七元环烷烃的C O键的排他不对称还原。在温和条件下,使用稳固且可商购的手性二胺衍生钌络合物作为催化剂,HCOOH / Et 3 N作为氢源,进行不对称转移氢化,给出了51种示例手性环外烯丙基醇,收率高达96%, 99%ee。该方法也适用于抗炎洛索洛芬和天然产物(-)-goniomitine的活性中间体的克级合成。