Melanotropin Receptors II. Synthesis and Biological Activity of α-Melanotropin/Tobacco Mosaic Virus Disulfide Conjugates

Asymmetric disulfide conjugates of mercaptosuccinyl tobacco mosaic virus (TMV ～ SH) with N^α-desacetyl-N^α-5-(mercaptovaleryl)-α-melanotropin were prepared via the S-sulfoderivative of the peptide. The conjugates, TMV ～ S? S ～ α-MSH(n), contained up to n = 330 disulfide-linked peptide molecules/virion. Similarly, fluorescent conjugates, Rh(m) ～ TMV ～ S? S ～ α-MSH(n) were prepared, containing m ≈? 200 rhodamine molecules linked to the virions by thiourea bridges. Such conjugates were designed to study α-MSH receptor localization and dynamics (mainly internalization), because the carrier virions which served to enhance specific receptor binding and as fluorescent or radioactive markers may be detached from the neuropeptides at will by reduction. Reduction occurred in solution and on the cell surface, but not in the cytoplasm, thus allowing detection of internalized agonist-receptor complexes. The conjugates were superpotent agonists for tyrosinase stimulation in Cloudman S-91 melanoma cell cultures, but were inactive for cyclic AMP accumulation. Their rather rapid internalization and the influence of reducing agents and other agonists on their biologic activity suggest a close connection between receptor location and biologic response as well as the presence of essential receptor HS-groups.     

5-(3′-芳基-5′-噁唑烷酮基甲氧基)-3(2H)哒嗪酮类化合物的合成及生物活性

5-(3′-芳基-5′-噁唑烷酮基甲氧基)-3(2H)哒嗪酮类化合物的合成及生物活性;芳基噁唑烷酮基甲氧基哒嗪酮;合成;生物活性     

Synthesis and Biological Activity of α-Methylene-γ-butyrolactones

α-Methylene-γ-butyrolactones [dihydro-3-methylene-2(3H)furanones] constitute an important group of natural products and possess wide-ranging biological activities. Progress in the synthesis of the heterocycle and the classification of the synthetic methods are not only of practical interest, but also fundamentally important as a current example for the construction of an unusual 1,4-functionality distance and an α-substituted acrylic ester moiety which is susceptible to nucleophilic attack.     

Synthesis and polymerization of N-[4-N′- (α-methylbenzyl)aminocarbonylphenyl]maleimide

A novel type of optically active N-[4-N′-(α-methylbenzyl)aminocarbonylphenyl]maleimide [(R)-MBCP] was synthesized from maleic anhydride, p-aminobenzoic acid, and (R)-methylbenzylamine. Radical homopolymerization of (R)-MBCP was performed in tetrahydrofuran (THF) at 50 and 70°C for 24 h to give optically active polymers having [α]²⁵_D = -141° and -129°, respectively. Anionic polymerization of (R)-MBCP with n-butyllithium in THF and N,N-dimethylformamide gave an optically active polymer having ?78 to ?81° of [α]²⁵_D. Radical copolymerizations of (R)-MBCP (M₁) were performed with styrene (ST, M₂) and methyl methacrylate (MMA, M₂) in THF at 50°C. The monomer reactivity ratios (r₁, r₂) and the Alfrey-Price Q-e values were determined as follows: r₁ = 0.009, r₂ = 0.091, Q₁ = 1.30, e₁ = 1.87 in the (R)-MBCP-ST; r₁ = 0.27, r₂ = 1.21, Q₁ = 0.93, e₁ = 1.46 in the (R)-MBCP-MMA system. Chiroptical properties of the polymers were also investigated. © 1992 John Wiley & Sons, Inc.     

Synthesis and Biological Activity of 3-Aryl-5-(aryloxymethyl)-1,2,4-oxadiazoles

Russian Journal of Organic Chemistry - A preparative procedure has been developed for the synthesis of a series of new medicinally relevant 3-aryl-5-(aryloxymethyl)-1,2,4-oxadiazoles in...     

Divergent Melanophore-Dispersing and Tyrosinase-Stimulating Activity of Synthetic Leucine9-α-melanotropin

Leucine⁹-α-melanotropin ([Leu⁹]α-MSH) was synthesized in homogeneous solution by a fragment condensation approach, and it was assayed for its melanophore-dispersing and its tyrosinase-stimulating activity with a reflectometric in vitro frog skin assay and with cultured mouse melanoma cells, respectively. In both assay systems, parallel log dose-response curves were obtained for ([Leu⁹)]α-MSH and α-MSH; however, in the frog skin assay the activity of the title compound was 1 middot; 10¹⁰ Units/mmol, i.e. 25% of the activity of α-MSH, whereas its tyrosinasestimulating potency was only 1% compared to α-MSH (EC₅₀= 2.5 · 10^?7M ). This indicates a major difference in the recognition/stimulation process of the receptors of the two cell types.     

Synthesis of (E)-5-oxo-2-(3-α and 3β-hydroxy-1-octenyl)-1-(4-N-pyrrolidine-2-butynyl)pyrrolidine

The synthesis of an oxotremorine analog, (E-5-oxo-2-(3α and 3β-hydroxy-1-octenyl)-1-(4-N-pyrrolidino-2-butynyl)pyrrolidine, is reported.     

N-(1H-3-羧基-1,2,4-三唑-5-基)-N''''-芳氧乙酰基脲的合成及生物活性

通过5-氨基-1,2,4-三唑-3-羧酸与芳氧乙酰基异氰酸酯反应,合成了9个新的N-(1H-3-羧基-1,2,4-三唑-5-基)-N'-芳氧乙酰基脲,用核磁共振氢谱、红外光谱和元素分析证明了目标化合物的结构.室内的生物活性测定试验证明,部分目标化合物具有良好的植物生长调节活性.     

N'-5-四唑基-N-芳甲酰基硫脲的合成及其生物活性研究（I）

为寻找新的高活性农药，根据生物等排原理，设计合成了10种未见文献报道的 N'-5-(1H-1,2,3,4-四唑基）-N-芳甲酰基硫脲类化合物。它们的结构经IR，~1H NMR和元素分析确证。初步的生物活性测定结果表明，部分化合物具有优良的除草 活性或植物生长调节活性。     

α-(5—四唑基)氨基烃基膦酸酯的合成及其生物活性

合成了12个新的5—氨基—1H—1，2，3，4—四唑的Schiff碱，而后与亚磷酸 二乙酯反应，合成出了12个新的含四唑基的α-氨基烃基膦酸酯，通过IR，^1H NMR，^31P NMR和元素分析证实了它们的结构．生物活性实验证明，一些目标化合 物具有良好的植物生长调节活性，其中氯代苯甲醛和吲哚甲醛的Schiff碱生成的α -氨基烃基膦酸酯的生长素活性更好。     

Synthesis and polymerization of N-[N′-(α-methylbenzyl)aminocarbonyl-n-alkyl]maleimide

Two types of optically active N-[N′-(α-methylbenzyl)amino/carbonyl-n-alkyl]maleimides (MBAC) were synthesized from maleic anhydride, 6-amino-n-caproic acid (or 12-amino-n-dodecanoic acid), and (R)-(+)-α-methylbenzylamine. Radical homopolymerizations of MBAC were performed in several solvents at 60 and 110°C for 24 h to give optically active polymers. Radical copolymerizations of MBAC were performed with styrene (ST) and methyl methacrylate (MMA) in dioxane at 60°C. The monomer reactivity ratios and the Alfrey-Price Q-e values were determined. Chiroptical properties of the polymers and copolymers were investigated. © 1995 John Wiley & Sons, Inc.     

微波作用下1-苯基-5-[5-(芳胺羰基甲硫基)-4-苯基-1,2,4-三唑-3-甲硫基]四唑的合成及生物活性

采用微波和相转移催化法通过1-苯基-5-(4-苯基-1,2,4-三唑-5-巯基-3-甲硫基)四唑(2)与2-氯乙酰芳胺(3)反应高效、快速地合成了10种尚未见文献报道的1-苯基-5-[5-(芳胺羰基甲硫基)-4-苯基-1,2,4-三唑-3-甲硫基]四唑. 其结构经 IR, ¹H NMR, ¹³C NMR 和元素分析表征. 生物活性实验结果表明, 该类化合物在较低浓度下部分化合物对小麦芽有很好的促进作用.     

1-芳酰基-4-(5-芳基-2-呋喃甲酰基)氨基硫脲衍生物的合成及其生物活性

酰胺基硫脲;芳基酰肼;1-芳酰基-4-(5-芳基-2-呋喃甲酰基)氨基硫脲衍生物的合成及其生物活性     

5-(3′-芳基-5′-(口恶)唑烷酮基甲氧基)-3(2H)哒嗪酮类化合物的合成及生物活性

(口恶)唑烷酮及其衍生物已广泛用于医药农药化工领域[1～4],如抗感染类药物痢特灵和高效杀菌剂农利灵[5].     

1-(嘧啶基-4)-3-(2,6-二氟苯甲酰基)脲衍生物的合成与生物活性

为了寻找高效、低毒、低残留的环境友好杀虫剂, 设计并合成了12个新的1-(嘧啶基-4)-3-(2,6-二氟苯甲酰基)脲衍生物6a～6l, 其结构经IR, ¹H NMR, LC/MS和元素分析确证. 初步生物活性测试结果表明, 部分化合物具有明显的杀虫活性, 如6g在100 mg/L浓度下, 对粘虫(Mythimna sepatara)具有100%的杀虫活性.     

Synthesis,Structure and Biological Activity of 3-Methyl-4-(3-nitrobenzylideneamino)-5-ethoxycarbonyl-methylsulfanyl-1,2,4-triazole

A Schiff base was synthesized by 3-methyl-4-amino-5-ethoxycarbonyl-methylsulfanyl-1,2,4-triazole with 3-nitrobenzaldehyde. The structure was confirmed by 1H NMR, IR, H RMS, TGA techniques and X-ray diffraction. The crystal belongs to monoclinic system, space group P21/c, with a = 8.965(2), b = 21.903(5), c = 9.197(2) A, β = 114.011(4)°, C14H15N5O4 S, Mr = 349.08, V = 1649.7(6) A3, Dc = 1.407 g·cm-3, Z = 4, F(000) = 728, μ = 0.226 mm-1, the final R = 0.0574 and wR = 0.1336 for 2932 unique reflections with I 2σ(I). Furthermore, the biological activity to four vegetable pathogens has been tested. The title compound exhibits better biological activity to four vegetable pathogens compared to the Schiff base without 5-ethoxycarbonyl and to Gibberlla saubinetti in EC95 compared with triadimefon.