摘要:
A synthesis process of precursors of derivatives of beta-lactam compounds, said beta-lactam compounds being selected from 6-aminopenicillanic acid and 7-aminocephalosporanic acid, preferably 6-aminopenicillanic acid, comprising the following steps: a) protection of the amine group of the beta-lactam compound, selected from 6-aminopenicillanic acid and 7-aminocephalosporanic acid, preferably 6-aminopenicillanic acid, through the formation of a carbamate by reaction with a dicarbonate; b) esterification of the carboxyl group in position 2 of the beta-lactam compound obtained in step a) by reaction with propargyl alcohol.
摘要:
An object of the invention is to provide an industrially advantageous process capable of remarkably suppressing the generation of an undesirable by-product cepham compound to thereby efficiently produce a desired 2α-methyl-2β-[(1,2,3-triazol-1-yl)methyl]penam-3α-carboxylic acid ester. In the present invention, a diphenylmethyl 2β-bromomethyl-2α-methylpenam-3α-carboxylate (BMPB) is reacted with 1,2,3-triazole in a halogenated hydrocarbon solvent at −5° C. or lower. The reaction in a halogenated hydrocarbon solvent at −5° C. or less can remarkably suppress the generation of an undesirable by-product cepham compound, so that the desired diphenylmethyl 2α-methyl-2β-[(1,2,3-triazol-1-yl)methyl]penam-3α-carboxylate (TMPB) can be efficiently produced.
摘要:
The invention relates to crystalline amoxicillin trihydrate powder having a bulk density higher than 0.45 g/ml. The invention also relates to a process for preparing crystalline amoxicillin trihydrate powder, said process comprising: crystallizing amoxicillin trihydrate from a solution containing dissolved amoxicillin; separating the crystals from said solution; and drying the separated crystals, resulting in crystalline powder having a bulk density higher than 0.45 g/ml.
摘要:
An object of the invention is to provide an industrially advantageous process capable of remarkably suppressing the generation of an undesirable by-product cepham compound to thereby efficiently produce a desired 2α-methyl-2β-[(1,2,3-triazol-1-yl)methyl]penam-3α-carboxylic acid ester. In the present invention, a diphenylmethyl 2β-bromomethyl-2α-methylpenam-3α-carboxylate (BMPB) is reacted with 1,2,3-triazole in a halogenated hydrocarbon solvent at −5° C. or lower. The reaction in a halogenated hydrocarbon solvent at −5° C. or less can remarkably suppress the generation of an undesirable by-product cepham compound, so that the desired diphenylmethyl 2α-methyl-2β-[(1,2,3-triazol-1-yl)methyl]penam-3α-carboxylate (TMPB) can be efficiently produced.
摘要:
Embodiments of an apparatus, system, and method for chemical synthesis and/or analysis are disclosed. One embodiment of a disclosed apparatus comprises a laminated, microfluidic structure defining a reactor and a separator. Such apparatuses, or portions thereof, generally have dimensions ranging from about 1 micrometer to about 100 micrometers. To implement synthetic processes, disclosed embodiments of the apparatus generally include at least one unit operation, such as a mixer, a valve, a separator, a detector, and combinations thereof. Individual apparatuses may be coupled both in series and in parallel to form a system for making chemical compounds. An individual apparatus or a system also can be used in combination with known devices and processes.
摘要:
The present invention provides a method for preparing a β-lactam compound of the following Formula (3), which comprises the step of reacting a compound of the following Formula (1) with a trialkyl phosphite represented by the formula (R5O)3P (wherein R5 represents an ethyl group, etc.) in an amount of 2 to 5 moles per mole of the compound and the step of heating the resulting reaction mixture in a diluent, wherein said method is characterized by having the step of completely removing unreacted trialkyl phosphite from the reaction mixture prior to the step of heating. (wherein X represents S, etc., Y represents N, etc., n represents 0 or 1, R1 represents an optionally substituted alkyl group containing 1 to 10 carbon atoms, etc., R2 and R3 each represent an optionally substituted alkyl or heterocyclic group, etc., and R4 represents an alkenyloxy group containing 1 to 6 carbon atoms, etc., provided that R1 and R2 may together form a β-lactam ring, etc.)
摘要:
The present invention provides a process for the substitution of an acylamino .beta.-lactam compound at the carbon atom carrying the acylamino group, which process comprises reacting the .beta.-lactam compound with an halogenating agent and a nucleophilic reagent; characterized in that the acylamino group has an acidic group on the carbon atom adjacent the carbonyl group. In particular the process of this invention comprises reacting a .beta.-lactam of partial structure (I): ##STR1## where X represents an acidic group; with an halogenating agent and a nucleophilic reagent.
摘要:
A method for preparing compounds of formula (I): ##STR1## wherein: R.sup.1 is hydrogen or a hydroxy-protecting group; R.sup.2 is alkyl, alkoxy, halogen, optionally substituted phenyl or optionally substituted phenoxy; R.sup.3 is optionally substituted pyridyl, optionally substituted quinolyl or phenyl group which has a substituent of formula --CYNR.sup.5 R.sup.6, where Y is oxygen or sulfur, and R.sup.5 and R.sup.6 are each alkyl, aryl or aralkyl, or R.sup.5 and R.sup.6 and the nitrogen to which they are attached together form a heterocyclic group; R.sup.4 is hydrogen or an amino-protecting group; and Z is sulfur or oxygen. The process comprises reacting a compound of formula (II): ##STR2## in which R.sup.8, R.sup.9 and R.sup.10 are the same or different and each represents an alkyl group having from 1 to 4 carbon atoms or a phenyl group, with a compound of formula (III): ##STR3## in which R.sup.11 represents an acyloxy, alkylsulfonyl, arylsulfonyl, alkylsulfinyl or arylsulfinyl group.
摘要翻译:制备式(I)化合物的方法:其中:R1是氢或羟基保护基; R 2是烷基,烷氧基,卤素,任选取代的苯基或任选取代的苯氧基; R3是任选取代的吡啶基,任选取代的具有式-CYNR 5 R 6的取代基的喹啉基或苯基,其中Y是氧或硫,R 5和R 6各自是烷基,芳基或芳烷基,或者R 5和R 6以及它们 一起形成杂环基; R4是氢或氨基保护基; Z是硫或氧。 该方法包括使式(II)化合物:其中R 8,R 9和R 10相同或不同并且各自表示具有1至4个碳原子的烷基或苯基的式(II)化合物与 式(III)化合物:其中R 11表示酰氧基,烷基磺酰基,芳基磺酰基,烷基亚磺酰基或芳基亚磺酰基。
摘要:
A substantially flat collapsed plastic bag with an evacuation form unit insert positioned therein as manufactured to serve as a form about which the filled bag will collapse as it is emptied. The form unit comprises a ring for mounting the unit on the spout of the bag and a multi-channel form extending radially from the ring and hingedly connected thereto. A simple method is provided for manufacturing the bag with the form unit insert.