Synthesis and antiviral, insecticidal, and fungicidal activities of gossypol derivatives containing alkylimine, oxime or hydrazine moiety
摘要:
Gossypol is a part of the cotton plant's defense system against pathogens and herbivorous insects. To discover gossypol analogs with broad spectrum and high activity, a series of gossypol alkylamine Schiff base, oxime and hydrazone derivatives were synthesised and bioassayed. The biological results indicated that most of these derivatives exhibited higher anti-TMV activity than gossypol. Interestingly, the activities of compounds 10, 15, 18, 20, 23 and 26 were much higher than that of ribavirin. Furthermore, compound 26, which was low toxicity to rat, showed better activity than control plant virus inhibitors in the field. Additionally, allyl amine Schiff base (9) displayed remarkable insecticidal activities against Mythimna separata, Helicoverpa armigera and Ostrinia nubilalis, whereas (pyridin-3-yl) methanamine Schiff base (13) showed excellent activity against Culex pipiens pallens. The fungicidal results revealed that all of compounds exhibited good activity against Physalospora piricola. (C) 2015 Elsevier Ltd. All rights reserved.
A Short and Efficient Synthesis of 3,4-Dialkoxypyrroles
作者:Andreas Merz、Thomas Meyer
DOI:10.1055/s-1999-3687
日期:——
3,4-Dialkoxypyrroles are obtained in four steps from commercially available 2,5-dimethoxy-2,5-dihydrofuran (1). The dihydrofuran 1 is first oxidized by KMnO4 to the diol 2 which is bisalkylated to 3a-d. Reaction of the in situ generated dialdehydes with a primary amine affords the N-substituted dialkoxypyrroles 4a-m. N-Benzyl-3,4-dialkoxypyrroles and N-allyl-dialkoxypyrroles are cleaved by sodium in liquid ammonia affording N-unsubstituted dialkoxypyrroles 5a-c in good overall yield.
Synthesis and DNA binding properties of saturated distamycin analogues
作者:Craig R. Woods、Nicolas Faucher、Bernd Eschgfaller、Kenneth W. Bair、Dale L. Boger
DOI:10.1016/s0960-894x(02)00467-5
日期:2002.9
saturated heterocyclic analogues of distamycin were prepared and examined. A fluorescent intercalator displacement (FID) assay conducted on p[dA]-p[dT] DNA to obtain C(50) values and a hairpin deoxyoligonucleotide containing an A/T-rich binding site was used to evaluate DNA binding affinity. It is observed that saturated heterocycles greatly reduce the DNA binding relative to distamycin.
Novel substituted 2,4,8-trisubstituted 8H-pyrido[2,3-d]pyrimidin-7-one containing compounds and compositions, and their use use in therapy as CSBP/RK/p38 kinase inhibitors.
Novel substituted 2,4,8-trisubstituted 8H-pyrido[2,3-d]pyrimidin-7-one containing compounds and compositions, and their use in therapy as CSBP/RK/p38 kinase inhibitors.