DDQ-Promoted Benzylic/Allylic sp<sup>3</sup> C–H Activation for the Stereoselective Intramolecular C–N Bond Formation: Applications to the Total Synthesis of (−)-Codonopsinine, (+)-5-<i>epi</i>-Codonopsinine, (+)-Radicamine B, and (−)-Codonopsinol
This is the first report on an intramolecular C–N bond formation of an amide-tethered benzylic/allylic system using DDQ under neutral conditions which has been successfully applied to the total synthesis of naturally occurring pyrolidine alkaloids. The key steps for the synthesis of corresponding precursors involve Julia–Kociensky olefination/cross-metathesis and dihydroxylation reactions, and this
Catalyst-Controlled Wacker-Type Oxidation of Protected Allylic Amines
作者:Brian W. Michel、Jessica R. McCombs、Andrea Winkler、Matthew S. Sigman
DOI:10.1002/anie.201004156
日期:——
contrary: Utilizing the [Pd(quinox)]–TBHP catalyst system, protectedallylicamines were oxidized with high selectivity for the methyl ketone product. This is contrary to the results obtained by the substrate‐controlled Tsuji–Wacker oxidation, which highlights the catalyst‐controlled system presented here (see scheme). A variety of N‐protecting groups undergo selective oxidation with high ketone selectivity
相反:利用 [Pd(quinox)]-TBHP 催化剂体系,受保护的烯丙胺被氧化,具有高选择性,生成甲基酮产物。这与通过底物控制的 Tsuji-Wacker 氧化获得的结果相反,这突出了此处介绍的催化剂控制系统(参见方案)。各种 N 保护基团以高酮选择性进行选择性氧化。TBHP=叔丁基过氧化氢。
Synthesis, Conformational Analysis, and Biological Evaluation of 1-Hexylindolactam-V10 as a Selective Activator for Novel Protein Kinase C Isozymes
作者:Ryo C. Yanagita、Yu Nakagawa、Nobuhiro Yamanaka、Kaori Kashiwagi、Naoaki Saito、Kazuhiro Irie
DOI:10.1021/jm0706719
日期:2008.1.1
Conventional and novel protein kinase C (PKC) isozymes are the main targets of tumor promoters. We developed 1-hexylindolactam-V10 (5) as a selective activator for novel PKC isozymes that play important roles in various cellular processes related to tumor promotion, ischemia-reperfusion injury in the heart, and Alzheimer's disease. The compound existed as a mixture of three conformers. The trans-amide restricted analogues of 5 (14 and 15) hardly bound to PKC isozymes, suggesting that the active conformation of 5 could be that with a cis-amide. Compound 5 selectively translocated novel PKC isozymes over conventional PKC isozymes in HeLa cells at 0.1-1 mu M. These results suggest that 5 could be useful for the functional analysis of novel PKC isozymes.