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What is claimed is: 1. A new general method for preparation of N-methoxy-N-methylamides. Method of the systhesis of 6-methylene derivatives of androsta-1,4-diene-3,dione. JPHB2 en. Baldwin et al.

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  • WO// PROCESS FOR OBTAINING 17β(NTERCBUTYLCARBAMOYL)3ONE4AZASTEROIDS

  • Raga Consultores, S.A.

    images raga consultores s l

    is a Spanish company based in Valladolid. The company is a chemical analysis laboratory that offers client consultations. It is also a. Get to know Raga Consultores, S.L.

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    JPHB2 en. TWIB en. The reaction is carried out for 5 hours, gently heating the mixture until reflux is reached.

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    Williams et al. Lithium tert-butylamide [tBuNHLi] may be easily obtained by reaction of tert-butylamine with butyllithium in an aprotic organic solvent, for example, tetrahydrofuran, according to the reaction:. JPA ja.

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    What is claimed is: 1.


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    A preferred group of compounds of general formula I is that in which a represents a double bond, one of whose representative compounds is finasteride. KRB1 en.

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    USA en. When the structure of the ester and that of the amine are complex, the reactivity between both compounds reduces and the level of transformation may be practically zero. In a flask, preferable dry, under a nitrogen atmosphere, The following examples illustrate the invention and should not be considered as limiting the scope thereof. As can been seen from said scheme, a compound of formula II is converted into the dilithiated intermediate IVthe hydrolysis of which yields the compound of formula I.

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    WO// PROCESS FOR OBTAINING 17β(NTERCBUTYLCARBAMOYL)3ONE4AZASTEROIDS

    IPC: C07J 73/ Applicants: RAGA CONSULTORES, S.L. SILVA GUISASOLA, Luis Octavio BLANCO FERNANDEZ, Cristina LORENTE BONDE-LARSEN. IPC: C07D / Applicants: RAGA CONSULTORES, S.L. GARCÍA LOSADA, Pablo SILVA GUISASOLA, Luis, Octavio LORENTE BONDE-LARSEN, Antonio.
    CAC en.

    What is claimed is: 1. DED1 en. Synthesis of aracemic trans-2, 3-disubstituted pyrrolidines. DET2 nl. When the derivative of carboxylic acid is an ester, its reaction with the amine to form the amide occurs satisfactorily when the ester and the amine have certain characteristics, such as high reactivity and absence of steric hindrance.

    The high reactivity of the lithium tert-butylamide allows work at high concentrations with the subsequent saving in use of solvent.


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    USA en.

    WOA1 nl. The reaction between the compound of formula II and lithium tert-butylamide seems to take place in accordance with the following scheme:.

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    The mixture is then heated under reflux, taking approximately 1 hour, and the reflux maintained for 4 hours. DED1 de. When the structure of the ester and that of the amine are complex, the reactivity between both compounds reduces and the level of transformation may be practically zero.

    The solutions proposed in the state of the art for solving the problem of low reactivity between said esters and tert-butylamine may be sorted out in 3 groups: a those in which the amine is allowed to react with another derivative of carboxylic acid that confers on it greater reactivity, such as an acid halide; a representative example of this group is mentioned in U.

    4 thoughts on “Raga consultores s l”

    1. Method for preparing 17alpha-acetoxybeta- 4-n,n-dimethylaminophenyl norpregna-4,9-diene-3,dione, intermediates useful in the method, and methods for the preparation of such intermediates. USB2 en.

    2. Tris trimethylsilyl silane: an efficient hydrosilylating agent of alkenes and alkynes. EPA1 fr.

    3. The general processes for obtaining amides consist of reacting a derivative of carboxylic acid with the corresponding amine.