共查询到20条相似文献,搜索用时 15 毫秒
1.
Abstract A highly efficient method of synthesis of S-allyl-N-aryl dithiocarbamates using SnCl2 as a catalyst under solvent-free conditions is described. The mild reaction conditions, high yields, and shorter reaction period illustrate the good synthetic utility of this method. 相似文献
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2-Benzyl-1,4,5,6-tetrahydropyrimidines 1 (as ene-1,1-diamine N,C-tautomers) in diglyme reacted with ethyl benzoylacetate at 160 °C in an oil bath to give 1,2,3,4-tetrahydropyrido[1,2-a]pyrimidin-6-ones 3 and with dimethyl acetylenedicarboxylate in methanol at room temperature, leading to methyl 1,2,3,4-tetrahydropyrrolo[1,2-a]pyrimidin-7-ylideneacetates 5, respectively. 相似文献
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1,3-Dipolar cycloadditions involving 1,4-naphthoquinone and an azomethine ylide generated from α-amino acids and isatins have been used in this reaction to afford the pyrrolidine-2-spiro-3′-oxindole 4 or 5 with moderate to excellent yields. 相似文献
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Abstract Commercially available magnesium perchlorate is reported as an extremely efficient catalyst for the ring-opening reaction of epoxide with various primary and secondary amines, especially diphenyl amine, under solvent-free conditions at room temperature. 相似文献
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Abstract A series of enantiomerically pure (Z)-(?)-4-(1′-alkyloxy-1′-alkyloxycarbonyl-methylidene)-5(R)-[(1R)-menthyloxy]-γ-butyrolactones were synthesized and characterized in good to excellent yields via O-alkylation of (4R,5R)-(?)-4-ethoxyoxalyl-5-[(1R)-menthyloxy]-γ-butyrolactone with alkyl halides in the presence of K2CO3 in acetone at room temperature. 相似文献
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Novel chiral bisformamides have been prepared from (R,R)-1,2-cyclohexanediamine and utilized as Lewis bases in the asymmetric allylation of benzaldehyde with allyltrichlorosilane. The reaction in the presence of Lewis base 1i gave an 83:17 enantiomeric ratio (R/S) of the products in 90% isolated yield. 相似文献
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Renata G. Lara Dielson C. Rodrigues Samuel R. Mendes Rodrigo B. Panatieri Raquel G. Jacob Diego Alves 《合成通讯》2013,43(20):2974-2984
The synthesis of several ricinoleic acid thiol esters starting from cis-(R)-12-hydroxyoctadec-9-enoic acid and thiols in the presence of N,N′-dicyclohexylcarbodiimide (DCC) is described. The method is efficient for aromatic and aliphatic thiols, selectively affording the respective fat acid thiol esters in good yields under mild, neutral, and solvent-free conditions. The protocol is general and was extended to other carboxylic acids, furnishing the desired products in satisfactory yields. The (R,Z)-12-hydroxy-octadec-9-enylic acid benzylthiol ester 3a was successfully reduced to (R,Z)-12-hydroxyoctadec-9-enal 4. 相似文献
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A mild and efficient one-pot reaction for the synthesis of 1-substituted β-carboline derivatives via the Minisci reaction has been developed with good yields and selectivity. In addition, the mechanism of the 1-substituted β-carboline derivatives by means of the nucleophilic radical is described. 相似文献
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Ashot S. Saghiyan Satenik G. Petrosyan Luiza L. Manasyan Slavik A. Dadayan Arpine V. Geolchanyan Henry A. Panosyan 《合成通讯》2013,43(4):493-506
Abstract The reactions of asymmetric C-alkylation of glycine and alanine in NiII complexes of their Schiff's bases with modified chiral auxiliaries (S)-2-N-[(N′-2-chlorobenzylprolyl)amino]benzophenone and (S)-2-N-[N′-(3,4-dimethylbenzylprolyl)amino]benzophenone by fluorine-substituted benzyl halogenides have been studied. As a result, a highly stereoselective and relatively rapid method for the asymmetric synthesis of (S)-o-, m-, p-fluorophenylalanines and their 2-methyl substituted analogs has been developed. 相似文献
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The TiCl4-catalyzed Friedel–Crafts reaction with trifluoroacetaldehyde ethyl hemiacetal is shown to serve as an efficient route for the synthesis of CF3-substitituted compounds of biological and synthetic importance, producing 2,2,2-trifluoroethyl phenols in good yields under mild conditions. 相似文献
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Lalthazuala Rokhum 《合成通讯》2013,43(4):548-552
Abstract A simple, straightforward, and environmentally benign protocol for the synthesis of adipic acid from oxidation of cyclohexanone with Oxone® in the presence of 0.5 mol% RuCl3 · nH2O is reported. The reaction completes within a very short time even at room temperature. The generality of the method is shown successfully for synthesis of other C-5 to C-8 dicarboxylic acids. 相似文献
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A simple and efficient method has been developed for the synthesis of sulfonamide phosphonates from N-tosyl aldimines and dimethyl trimethylsilyl phosphite at 0 °C in the presence of Amberlyst-15 as a heterogeneous catalyst.
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Anna Kowalkowska 《合成通讯》2013,43(22):3308-3317
N-Cyanomethyl-N,N-dimethyl-N-(α-methoxycarbonyl)benzylammonium salts 5 were synthesized and treated with different base/solvent systems, giving the products of sigmatropic rearrangements [2,3] 7 and [1,2] 8. In reactions carried out in liquid ammonia, [2,3] rearrangement definitively prevailed. Pure 7(or mixture of 7 and 8) were deprotected to afford methyl 2-formylphenyl acetate (9) in good yield. 相似文献
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The compound (Z)-ethyl 5-(phenylamino)-3-(phenylimino)-3H-1,2-dithiole-4-carboxylate 3 has been synthesized by the reaction of ethylacetoacetate 1 and phenylisothiocyanate 2. Its structure has been established by 1H NMR, 13C NMR, infrared, mass spectra, and x-ray crystallography. 相似文献