Molybdenum oxide/bipyridine hybrid material {[MoO3(bipy)][MoO3(H2O)]}n as catalyst for the oxidation of secondary amines to nitrones
作者:Marta Abrantes、Isabel S. Gonçalves、Martyn Pillinger、Carolina Vurchio、Franca M. Cordero、Alberto Brandi
DOI:10.1016/j.tetlet.2011.10.079
日期:2011.12
catalyst for the oxidation of secondaryamines under mild conditions using either urea hydrogen peroxide (UHP) or tert-butylhydroperoxide (TBHP) as the oxidant. Under optimized reaction conditions (2 mol % catalyst, 3–4 equiv TBHP, CH2Cl2 as the solvent, 40 °C), the corresponding nitrones were obtained with different efficiency depending on the nature of the cyclic or acyclic amine used.
(−)-(1R,2R,7S,8aR)-1,2,7-Trihydroxyindolizidine ((−)-7S-OH-Lentiginosine): Synthesis and Proapoptotic Activity
作者:Franca M. Cordero、Paola Bonanno、Bhushan B. Khairnar、Francesca Cardona、Alberto Brandi、Beatrice Macchi、Antonella Minutolo、Sandro Grelli、Antonio Mastino
DOI:10.1002/cplu.201100069
日期:2012.3
An improved approach for the preparation of enantiopure 3,4‐bis‐tert‐butoxypyrroline N‐oxides is presented. Etherification of 1‐benzylpyrrolidine‐3,4‐diol with tBuOAc/HClO4 and subsequent N‐debenzylation and pyrrolidine oxidation with oxone affords the cyclic nitrone reliably and in superior yield. The enantiomer derivedfrom D‐tartaricacid was exploited in a modified synthesis of (−)‐7S‐OH‐lentiginosine
提出了一种改进的制备对映体3,4-二叔丁氧基吡咯啉N-氧化物的方法。用t BuOAc / HClO 4对1-苄基吡咯烷-3,4-二醇进行醚化反应,随后进行N-脱苄基化反应和吡咯烷氧化并用氧杂环丁烷进行氧化,可可靠地提供环硝酮,并具有较高的收率。衍生自D-酒石酸的对映体被用于(-)-7 S -OH-lentiginosine的改良合成中。检验了这种三羟基吲哚并咪唑在诱导淋巴样和上皮来源的肿瘤细胞系凋亡中的活性。