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Relevant academic research and scientific papers

Efficient Preparation of Alkaloids Polycarpine and Polycarpaurines A and C

An efficient method for the preparation of alkaloids polycarpine and polycarpaurines A and C via microwave-assisted three-step one-pot reaction as the key step has been developed. This is the first report about the synthesis of polycarpaurines A and C. Starting from commercially available p-methoxybenzaldehyde, polycarpine and polycarpaurine A were obtained over seven steps with 40 and 24 % overall yield, respectively. Polycarpine could convert to polycarpaurine C in 72% yield in the presence of NaHSO3. The structure of polycarpine and polycarpaurines A and C was confirmed by1H NMR,13C NMR, and HRMS.

Polycarpine derivatives, synthesis of derivatives and application of derivatives in control of plant viruses and pathogenic bacteria

The invention relates to Polycarpine derivatives, preparation of the derivatives and an application of the derivatives in controlling plant viruses and pathogenic bacteria. A meaning of R in the formula is as shown in the description. The Polycarpine deri

First discovery of polycarpine, polycarpaurines A and C, and their derivatives as novel antiviral and antiphytopathogenic fungus agents

Marine natural products polycarpine, polycarpaurines A and C, and their derivatives were designed, synthesized, and characterized on the basis of 1H NMR and mass spectroscopy. The antiviral and antiphytopathogenic fungus activities of these alkaloids were first evaluated. Polycarpine derivative 1g displayed excellent in vivo antiviral activity against TMV (inactivation inhibitory effect, 57%/500 μg mL-1 and 19%/100 μg mL-1; curative inhibitory effect, 62%/500 μg mL-1 and 23%/100 μg mL-1; and protection inhibitory effect, 56%/500 μg mL-1 and 29%/100 μg mL-1), which is evidently higher than the activity of ribavirin (inactivation inhibitory effect, 37%/500 μg mL-1 and 9%/100 μg mL-1; curative inhibitory effect, 36%/500 μg mL-1 and 13%/100 μg mL-1; and protection inhibitory effect, 39%/500 μg mL-1 and 17%/100 μg mL-1), thus emerging as a new lead compound for antiviral research against TMV. Fungicidal testing in vitro showed that most of the compounds displayed good fungicidal activity against plant pathogenic fungi. Further in vivo fungicidal testing indicated that compounds 6a, 6f, and 8a-c displayed good fungicidal activity. Current results provide support for the development of polycarpine alkaloids as novel agrochemicals.

A divergent synthesis of substituted 2-aminoimidazoles from 2-aminopyrimidines

(Chemical Equation Presented) A new divergent and efficient synthesis of substituted 2-aminoimidazoles 5 and 6 has been developed starting from the readily available 2-aminopyrimidines 1 and α-bromocarbonyl compounds 2, using conventional heating or microwave irradiation. Thus, the cleavage of 1,2,3-substituted imidazo[1,2-a]pyrimidin-1-ium salts 4 with hydrazine or secondary amines led to 1,4,5-trisubstituted 2-aminoimidazoles 5, when the hydrazinolysis of 2-hydroxy-2,3-dihydro-1H-imidazo[1,2-a]pyrimidin-4-ium salts 3, followed by a novel Dimroth-type rearrangement, resulted in formation of 2-amino-1H-imidazoles 6. The relevant pathway of transformations was identified by characterization of the intermediates.

Efficient one-pot, two-step, microwave-assisted procedure for the synthesis of polysubstituted 2-aminoimidazoles

(Diagram presented) A microwave-assisted, one-pot, two-step protocol was developed for the construction of polysubstituted 2-aminoimidazoles. This process involves the sequential formation of imidazo[1,2-a]pyrimidinium salts from readily available 2-amino

Synthesis of polycarpine, a cytotoxic sulfur-containing alkaloid from the ascidian Polycarpa Aurata, and related compounds

Polycarpine 1, a highly cytotoxic marine natural product, has been synthesized in three steps from p-methoxyphenacyl bromide 4 in 57% overall yield. The key reaction for construction of the symmetrically substituted disulfide linkage of polycarpine is the treatment of 2-amino-4-(4-methoxyphenyl)-1-methylimidazole 17 with S2Cl2 in acetic acid. In a similar way ten related compounds, including three thiazole analogues, have been prepared. Most of them exhibit high cytotoxic activities against an array of human cancer cell lines.