Synthesis of tetrahydro-β-carbolines from phthalic anhydrides and tryptamine

Tetrahydro-b-carbolines with strictosamide skeleton have been synthesized via intermolecular condensation, selective reduction, and intramolecular cyclization starting from phthalic anhydrides and tryptamine. The reactions are carried out under mild conditions with a wide range of substrates and functional groups.

Au/FeO_x-TiO_2 as an efficient catalyst for the selective hydrogenation of phthalic anhydride to phthalide

Au/FeOx-TiO2,prepared by deposition-precipitation method,is an efficient and stable catalyst for the liquid phase selective hydrogenation of phthalic anhydride to phthalide under mild reaction conditions.

Investigation of Mechanisms About Effects of Promoters P_2O_5,K_2O and A1_2O_3 on Oxidation of o-Xylene to Phthalic Anhydride

We succeeded in designing an effective catalyst, V2O5-P2O5-K2O/Al2O3. SiO2, by which a high yield of PA,105wt% can be gained in middle-sized industrial fluidized bed apparatus without addition of any promoting gas.The mechanisms of effects of P2O5, K2O and Al2O3 on the surface properties of V2O5 were investigated by means of TPD and XRD. And the selectivity of oxidation are explained.Addition of a great deal of P2O5 restrains the activity of donating surface oxygen from V2O5, but increases the number of sites which donate surface oxygen. Addition of K2O promotes donation of surface oxygen from V2O6, and decreases the number of sites of donating oxygen, on the other hand, addition of K|O makes the surface structure of V2O5 catalysts more stable. Coating a small amount of Al2O2 onto support, SiO2, restrains the activity of donating oxygen and increases the number of sites of donating surface oxygen from V2O5.

Preparation of VPO Catalysts and Effect of Zirconium Promoter on the Selective Oxidation of Pentane

This study focuses on the effects of reducing solvents used in the preparation of vanadyl pyrophosphate （VPO）, and ZrO2 and （ZrO）2P2O7 promoters on the structure and catalytic performance of VPO catalysts. The VPO catalysts were prepared by the following steps： 1） Formation of vanadium phosphate by the reaction of V2O5 and H3PO4, 2） Synthesis of VPO precursor through the reduction of vanadium phosphate by reducing solvents, and 3） Activation of the precursor. For Zr promoted VPO, Zr was added to the precursor before activation. The P/V atomic ratios of different VPO catalysts, which were prepared by using different reducing solvents, were different. The precursor prepared by using isobutanol or isobutanol-benzyl alcohol contained VO（H2PO4）2 and VOHPO4·0.5H2O. The precursor prepared by using hexanol also contained VO（H2PO4）2 and VOHPO4·0.5H2O crystal phases, but the amount of VOHPO4·0.5H2O was much less than that of VO（H2PO4）2. After activation, all the VPO catalysts, prepared by using different reducing solvents, contained only the （VO）2P2O7 crystal phase. The VPO prepared by using isobutanol-petroleum ether as reducing solvent was the most active, while the VPO prepared by using hexanol had the lowest activity. Nevertheless, their total selectivity to phthalic and maleic anhydrides was almost the same. Both ZrO2 and （ZrO）2P2O7 promoters increased the activity and selectivity of VPO, but ZrO2 promoter increased the activity of VPO more drastically than （ZrO）2P2O7 promoter.

Ionic liquid [bmim][BF_4] acts as solvent and promoter for synthesis of halo-containing N-arylphthalimides

A new synthetic process of N-arylphthalimide and halo-containing N-arylphthalimides through the reaction between phthalic anhydride and aromatic amines bearing halo groups in [bmim][BF4] was described, ionic liquid [bmim][BF4] acted as the dual role of solvent and promoter.

Effects of aqueous extract from red Liriope platyphylla on phthalic-anhydride-induced atopic dermatitis in Interleukin-4/Luciferase/Consensus non-coding sequence-1 transgenic mice evaluated in terms of luciferase signal and general phenotype biomarkers

OBJECTIVE: To quantitatively evaluate the therapeutic effects of Red Liriope platyphylla(RLP) on atopic dermatitis(AD), alterations in the luciferase(Luc) signal and general phenotype biomarkers were compared in phthalic anhydride(PA) treated Interleukin-4(IL-4)/Luc/Consensus non-coding sequence-1(CNS-1) transgenic(Tg) mice following treatment with aqueous extract of RLP(AEt RLP) for4 weeks.METHODS: Alterations in AD phenotypes were measured in IL-4/Luc/CNS-1 Tg mice following treatment with AEt RLP using inflammation parameter analysis, bioluminescence imaging analysis, histological analysis, reverse transcription-polymerase chain reaction, enzyme linked immunosorbent assay and Western blot analysis.RESULTS: RLP contained high concentrations of total phenolic compounds, total flavonoid compounds and 5-HNE related to AD therapy. The Luc signal was only detected in the abdominal region and the submandibular lymph node(SL), mesenteric lymph node(ML), thymus and pancreas of the PA treated group. This signal was significantly decreased by 28%-73% throughout the body and in the four organs in PA + AEt RLP treated group. Furthermore, the lymph node weight, immunoglobulin E concentration and dermal thickness were decreased by 37%-67% in the PA + AEt RLP treated group.CONCLUSION: Our findings suggest that the therapeutic effect of AEt RLP on PA induced AD could be successfully quantified by comparison of Luc signals and AD phenotype markers in IL-4/Luc/CNS-1Tg mice, and that the Luc signal was as sensitive as the general AD phenotypes, enabling detection of effects without euthanasia.

Copper（I）-Catalyzed Trifluoromethylation of Phthalic Anhydride Derivatives with （Trifluoromethyl）trimethylsilane

An efficient copper-catalyzed trifluoromethylation of substituted phthalic anhydrides using （trifluoromethyl） trimethylsilane （Me3SiCF3） as a nucleophilic trifluoromethylating reagent in the presence of 1,10-phenanthroline and KF, followed by quenching the reaction mixture with water has been developed. A possible mechanism was suggested.