Polymer-Supported Tripyridylmethane Derivatives: Lewis Acid Catalyzed Ring Opening of Styrene Oxide.
摘要:
Tri(2-pyridyl)methanol was allowed to react with 1% crosslinked gel-type chloromethylated polystyrene in the presence of a base to yield a polymeric tridentate ligand. A macroporous chloromethylated polymer was unreactive under the same conditions. In this case, grafting was accomplished after reaction of tri(2-pyridyl)methanol with a spacer containing a phenolic group, which after deprotonation readily reacted with the polymer. An Fe(III) complex of the polymeric ligand was used as a Lewis acid in the methanolysis of styrene oxide.
Herein, we reported a Ni-catalyzed carbonylation of cyclopropanol with benzyl bromide to afford multisubstituted cyclopentenone under 1 atm of CO. The reaction proceeds through cascade carbonylation of benzyl bromides, followed by generation of nickel homoenolate from cyclopropanolsvia β-C elimination to afford 1,4-diketones, which undergoes intramolecular Aldol condensation to furnish highly substituted
在此,我们报道了 Ni 催化的环丙醇与苄基溴的羰基化反应,在 1 个大气压的 CO 下得到多取代的环戊烯酮。该反应通过苄基溴的级联羰基化进行,然后通过 β-C 消除从环丙醇生成高烯醇镍,得到 1 ,4-二酮,其经过分子内羟醛缩合以中等至良好的产率提供高度取代的环戊烯酮衍生物。该反应表现出高官能团耐受性和广泛的底物范围。
Tyrosine-Derived Novel Benzoxazine Active in a Rat Syngenic Mammary Tumor Model of Breast Cancer