Doing the methylene shuffle – Further insights into the inhibition of mitotic kinesin Eg5 with S-trityl l-cysteine
摘要:
S-Trityl L-cysteine (STLC) is an inhibitor of the mitotic kinesin Eg5 with potential as an antimitotic chemotherapeutic agent. We previously reported the crystal structure of the ligand protein complex, and now for the first time, have quantified the interactions using a molecular dynamics based approach. Based on these data, we have explored the SAR of the trityl head group using the methylene shuffle strategy to expand the occupation of one of the hydrophobic pockets. The most potent compounds exhibit strong (<100 nM) inhibition of Eg5 in the basal ATPase assay and inhibit growth in a variety of tumour-derived cell lines. (C) 2012 Elsevier Masson SAS. All rights reserved.
1,2-Arylmigration of α,α-diaryl tertiary azides was achieved by using the catalytic system of FeCl2/N-heterocyclic carbene (NHC) SIPr·HCl. The reaction generated aniline products in good yields after one-pot reduction of the migration-resultant imines.
Tertiary Alcohols by Tandem β-Carbolithiation and N→C Aryl Migration in Enol Carbamates
作者:Anne M. Fournier、Jonathan Clayden
DOI:10.1021/ol2029355
日期:2012.1.6
Enolcarbamates (O-vinylcarbamates) derivedfrom aromatic or α,β-unsaturated compounds and bearing an N-aryl substituent undergo carbolithiation by nucleophilic attack at the (nominally nucleophilic) β position of the enol double bond. The resulting carbamate-stabilized allylic, propargylic, or benzylic organolithium rearranges with N→C migration of the N-aryl substituent, creating a quaternary carbon
asymmetric catalysis using an effective chiralligand. Herein we report the Cu-catalyzed enantioselective alkylarylation of vinylarenesusing alkylsilyl peroxides as alkyl radical sources. This reaction proceeds under practical reaction conditions and affords chiral 1,1-diarylalkane structures that are found in a variety of bioactive molecules. Notably, a highly enantioselective reaction was accomplished
过渡金属催化的自由基中继偶联反应最近已成为实现烯烃双官能化的最有效方法之一。然而,在使用有效手性配体将这种方法应用于不对称催化方面的成功有限。在此,我们报告了使用烷基甲硅烷基过氧化物作为烷基自由基源的 Cu 催化的乙烯基芳烃的对映选择性烷基芳基化。该反应在实际反应条件下进行,并提供在各种生物活性分子中发现的手性 1,1-二芳基烷烃结构。值得注意的是,高度对映选择性反应是通过将手性双(恶唑啉)配体与手性联萘支架结合来实现的。
Wieland; Kloss, Justus Liebigs Annalen der Chemie, 1929, vol. 470, p. 216
作者:Wieland、Kloss
DOI:——
日期:——
Schlenk; Bergmann, Justus Liebigs Annalen der Chemie, 1928, vol. 463, p. 208