• Title/Summary/Keyword: Dicyclohexylcarbodiimide

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Cyclocondensation of 2-Substituted-4-hydroxy-2H-1, 2-benzothiazine-3-carboxylic acid 1, 1-dioxides with Dicyclohexylcarbodiimide (2-치환 4-Hydroxy-2H-1, 2-benzothiazine-3-carboxylic acid 1, 1-dioxidies와 Dicyclohexylcarbodiimide의 축합환화 반응)

  • 서정진;홍유화
    • YAKHAK HOEJI
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    • v.31 no.1
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    • pp.40-41
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    • 1987
  • 4-Hydroxy-2H-1, 2-benzothiazine-3-carboxylic acid 1a was reacted with 2 equivalents of dicyclohexylcarbodiimide (DCC) to give 2-cyclohexyl-3-cyclohexylimino-4,5-dihydro-1H-imidazo [1,5-b][1,2] benzothiazine-10, 10a-dyhydro-1,10-dione 5,5-dioxide 2a and dicyclohexylurea (DCU). On the other hand 2-substituted-4-hydroxy-2H-1, 2-benzothiazine-3-carboxylic acid 1,1-dioxide 1b or c was reacted with DCC to give 2-cyclohexylimino-3-cyclohexyl-5-alkyl-4-oxo-2,5H-1,3-oxazino [5,6-c]-1,2-benzothiazine 6,6-dioxide 2b or c and DCU.

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Synthesis of 2-Aroyloxyacetophenones as Intermediates for Flavone Synthesis (Flavone의 합성 중간체인 2-Aroyloxyacetophenone류의 새로운 합성법)

  • Song, Gyu-Yong;Ahn, Byung-Zun
    • YAKHAK HOEJI
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    • v.38 no.1
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    • pp.1-5
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    • 1994
  • We have synthesized some 2-(2-benzyloxybenzoyloxy)-and 2-(2,6-dibenzyloxybenzoyloxy)-acetophenones as intermediates for flavone synthesis. The reaction of polyoxygenated 2-hydroxyacetophenones with 2-benzyloxybenzoic acid or 2,6-dibenzyloxybenzoic acid in the presence of dicyclohexylcarbodiimide and p-dimethylaminopyridine resulted in a good yield$(70{\sim}89%)$ of 2-(2-benzyloxybenzoyloxy)-acetophenones or 2-(2,6-dibenzyloxybenzoyloxy) acetophenones under milder conditions and in shorter time than the previous methods. This new methods using benzoic acids instead of benzoyl chlorides saves one reaction step of acid chlorination in comparision of the previous methods.

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Synthesis of New Benzimidazo [2,1-b][1,3,5]benzothiadiazepine Derivatives (새로운 Benzimidazo[2,1-b][1,3,5]benzothiadiazepine 유도체들의 합성)

  • Jin, Byeong U;Jo, Seong Hui
    • Journal of the Korean Chemical Society
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    • v.38 no.5
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    • pp.382-390
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    • 1994
  • New 6-imino-5H-benzimidazo[2,1-b][1,3,5]benzothiadiazepine derivatives (8) were successfully synthesized in good yields from the N-[2-(benzimidazol-2-yl thio)phenyl]thiourea derivatives (6) in the presence of dicyclohexylcarbodiimide(DCC) and from N-[2-(benzimidazol-2-yl thio)phenyl]-S-methylisothiourea derivatives (7) with potassium carbonate.

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Study on the Synthesis of N,N'-Dicyclohexylcarbodiimide from N,N'-Dicyclohexylurea (디사이클로헥실우레아로부터 디사이클로헥실카르보디이미드의 합성에 관한 연구)

  • Kim, Jae Young;Chung, Dae-Won
    • Applied Chemistry for Engineering
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    • v.22 no.3
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    • pp.319-322
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    • 2011
  • N,N'-Dicyclohexylcarbodiimide (DCC) known as powerful dehydrating reagent in amide or ester synthesis is converted into N,N'-dicyclohexylurea (DCU) during the reaction. In the paper, DCU was recovered from the reaction for the synthesis of the hydrophilic derivative of ${\beta}$-sitosterol, and the purification of the recovered DCU and the dehydration of DCU into DCC were investigated. In the presence of tosyl chloride, (TsCl) and triethylamine (TEA), DCU was converted into DCC, and the optimum molar ratio of [DCU] : [TsCl] : [TEA] was found to be 1.0 : 1.5 : 3.0. Pure DCC was obtained with a 46% yield by the sublimation after the purification process, and characterized by GC/MS, FT-IR and $^{13}C-NMR$.

Synthesis and Cytotoxic Activity of Flavone Derivatives

  • 안병준
    • Proceedings of the Korean Society of Applied Pharmacology
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    • 1993.04a
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    • pp.40-40
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    • 1993
  • 2-Benzoyloxyacetophenones were prepared by reaction of benzooic acids and 2-hydroxyacetophenones in the presence of dicyclohexylcarbodiimide and 4-dimethylaminopyridine. The rearrangement of 2-Benzoyloxy acetophenones to 2-Dibenzoylmethans has been carried out in the presence of tetrabutylammoniumfl uoride( a phase transfer catalyst ). Both methods have been applied first for the synthesis of flavones and gave better yields of products and the reaction ran in shorter reaction time.

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A Study on the Synthesis of Amphiphilic Styrene Copolymers having Functional Groups on the Side Chain (곁사슬에 기능성기를 갖는 양친매성 스티렌 공중합체의 합성에 관한 연구)

  • Lee, Jung-Bock;Kim, Chang-Bae
    • Applied Chemistry for Engineering
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    • v.5 no.5
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    • pp.801-807
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    • 1994
  • Lactose substituted styrene monomer, N-(p-vinylbenzyl)-D-lactonamide(VLA) was prepared by coupling the lactose lactone with p-vinylbenzylamine. The carboxyl group of biotin was activated with N-hydroxysuccinimide in the presence of N, N'-dicyclohexylcarbodiimide. Subsquently, biotin substituted styrene monomer, N-(p-vinylbenzyl)-biotinamide(VBA) was prepared by amidation of the activated biotin with p-vinylbenzylamine. Poly(vinylbenzylactonamide-co-vinylbenzylbiotinamide), p(VLA-co-VBA) were synthesized through radical polymerization from the synthetic monomers(VLA-VBA) by using various mole ratio. The percentages of yield were 67~71%. The copolymers were found amphlphilic which had hydrophilic lactose, hydrophobic vinylbenzyl and biotin site within the structure. IR and $^{13}C-NMR$ analysis on the monomers and copolymer were carried out.

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Preparation and Characteristics of Surface-Modified Albumin Microspheres with Methotrexate (메토트렉세이트가 표면수식된 알부민 미립구의 제조 및 특성)

  • Hwang, Sung-Joo;Jo, Hang-Bum;Rhee, Gye-Ju;Kim, Chong-Kook
    • Journal of Pharmaceutical Investigation
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    • v.25 no.2
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    • pp.101-108
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    • 1995
  • The surface of albumin microspheres could be modified with methotrexate (MTX) by using 1,3-dicyclohexylcarbodiimide (DCC). Surface-modified albumin microspheres entrapping no MTX (SAMS), free MTX (SAMSF) and MTX-bovine serum albumin (BSA) conjugates (SAMSC) were prepared. respectively, and their release characteristics were investigated in the presence of trypsin using a dissolution tester. The mean diameters of all the microspheres were $5{\sim}8\;{\mu}m$, and their shapes was small and uniform. MTX bound tn their surfaces was released slower than the entrapped free MTX, and laster than the entrapped MTX-BSA conjugates. Also, surface-modified MTX was scarcely released in the absence of a proteolytic enzyme. Therefore, the surface-modified MTX may be released rapidly from SAMSC at the target site, and thereafter MTX may be released slowly from the encapsulated MTX-BSA conjugates in SAMSC for a long period.

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Synethesis of bradykinin analogues by new reaction vessel (새로운 반응기구에 의한 bradykinin 유사물의 합성)

  • Choi, Cheong
    • Applied Biological Chemistry
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    • v.34 no.4
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    • pp.334-338
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    • 1991
  • Synthesis of $(D-Phe^7\;-Leu^8)$ bradykinin and bradykinin by solid phase method using a new reaction vessel was carried out. Coupling was performed by dicyclohexylcarbodiimide. After cleavage with dried HBr the peptides were purified by high pressure liquied chromatography. Their purify was assayed by paper and thin layer chromatography, melting point and amino acid analysis. $(D-Phe^7\;-Leu^8)$ bradykinin and bradykinin were incubater in vitro endopeptidase $({\alpha}-chymotrysis)$ and exopeptidase(carboxypeptidase A, leucine aminopeptidase) in order to study the degradation pattern of peptides. $(D-Phe^7\;-Leu^8)$ bradykinin and bradykinin were rapidly degradated by ${\alpha}-chymotrypsin$ and carboxypeptidase A $(D-Phe^7\;-Leu^8)$ bradykinin and bradykinin coution$(D-Phe^7\;-Leu^8)$ bradykinin and bradykinin contain imino peptide bound from proline at N-terminal and therefore they were not attacted by leucine aminopeptidase.

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