摘要:
The invention relates to a process for the manufacture of an 1,2,4-triazol-1-yl compound of the formula [A], or a salt thereof, wherein each of R3 and R4 is hydrogen or lower alkyl, said process comprising reacting a hydrazine compound of the formula [B] wherein R is hydrogen or acyl, R2 is hydrogen or a protecting group, are hydrogen or lower alkyl, and R6 is hydrogen or COOR7, or a salt thereof, with a 1,2,4-triazolyl forming reagent. In addition, novel intermediates for the synthesis of the anti-migraine agent Rizatriptan and methods for their synthesis are presented.
摘要:
The present invention relates to a process for preparing a porphyrin of formula (I), optionally in the form of a salt with an alkali metal and/or in the form of a metal complex: in which: R and R′ are as defined in claim 1, comprising: a step of condensation, in an acidic medium, between a dipyrromethane of formula (II): in which R′b is as defined above for (I), and a dipyrromethane of formula (III): in which R″ is as defined in claim 1, and also the compounds of formula (III).
摘要:
The invention relates to a process for the manufacture of an 1,2,4-triazol-1-yl compound of the formula [A], or a salt thereof, wherein each of R3 and R4 is hydrogen or lower alkyl, said process comprising reacting a hydrazine compound of the formula [B] wherein R is hydrogen or acyl, R2 is hydrogen or a protecting group, are hydrogen or lower alkyl, and R6 is hydrogen or COOR7, or a salt thereof, with a 1,2,4-triazolyl forming reagent. In addition, novel intermediates for the synthesis of the anti-migraine agent Rizatriptan and methods for their synthesis are presented.
摘要:
The invention relates to a process for the sulfurization of phosphorus-containing compounds which comprises contacting the phosphorus compound to be sulfurized with a sulfur transfer reagent of formula (I) wherein R1 is aryl which can be substituted by halo, (C1–C6) alkyl or (C1-C6) alkoxy, and R2 is (C1–C6) alkyl, which could also form a cyclic ring together with R1, in a solvent or a mixture of solvents.
摘要:
The invention relates to a process for the preparation of 4-phenylpyrrole derivatives of the formula I ##STR1## wherein R.sub.n, R.sub.1 and R.sub.2 are as defined in claim 1, which comprises reacting a phenacylamine of formula II ##STR2## with a compound of formula IIIT--CH.dbd.CH--R.sub.1 (III)to give an intermediate of formula IV ##STR3## and cyclizing said intermediate, in the presence of a base, to give the compound I. Important intermediates and novel final products are also described.
摘要:
There is described a novel process for producing 1,2,5,6-tetrahydro-4H-pyrrolo[3,2,1-ij]-quinolin-4-one (4-lilolidone), usable as fungicide and corresponding to the formula ##STR1## as well as novel 5-halo-1,2,3-(1,2-dihydropyrrolo)-4-quinolones of the formula ##STR2## in which "Hal" is chlorine or bromine, which are formed as intermediates during the process.
摘要:
Novel 5-haloalkyl-pyridines suitable for producing pesticidal compositions, particularly insecticides, and corresponding to the formula ##STR1## wherein R is a C.sub.2 -C.sub.10 -alkyl group which is uniformly or nonuniformly substituted by 1 to 21 halogen atoms, and X is halogen;processes for producing them, as well as to the novel starting products and intermediates used or intermediately produced or formed in the production processes.
摘要:
There is described a new process for the preparation of optically active 2-(2',2'-dihalogenovinyl)-cyclopropane-1-carboxylic acids substituted in the 3 position, and derivatives thereof. A racemate of certain cyclobutanones is reacted with a sulfurous acid salt of an optically active base to obtain a mixture of diastereomeric 4-(2',2',2'-trihalogenoethyl)-cyclobutane-2-sulfonic acid salts; this mixture is then separated into the pure diastereomeric sulfonic acid salts. Either the pure diastereomeric sulfonic acid salts are converted directly to the desired optically active products, or the optically active cyclobutanones obtained from the pure diastereomeric sulfonic acids salts by decomposition are converted, in the presence of a base, to the desired product. Optionally, the product, optically active 2-(2',2'-dihalogenovinyl)-cyclopropane-2-carboxylic acids can be converted to their 1',2'-dibromo derivatives.
摘要:
A novel process for producing 2,3,5-trichloropyridine is described. The process comprises the addition reaction of trichloroacetaldehyde with acrylonitrile in the presence of a catalyst, and the subsequent cyclization of the intermediately formed 2,4,4-trichloro-4-formylbutyronitrile, with the splitting-off of water, to give 2,3,5-trichloropyridine.2,4,4-Trichloro-4-formylbutyronitrile occurring as an intermediate product in the process according to the invention is a novel compound. It can be produced by the addition reaction of trichloroacetaldehyde with acrylonitrile in the presence of a catalyst.2,3,5-Trichloropyridine can be used as intermediate for the production of herbicidal active substances.
摘要:
A process for the preparation of 2-(2',2',2',-trihalogenoethyl)-4-halogenocyclobutan-1-ones of the formula ##STR1## in which one of the radicals R.sub.1 and R.sub.2 is methyl and the other is hydrogen or methyl, or R.sub.1 and R.sub.2 together are an alkylene group having 2 to 4 carbon atoms, and X and Y are each chlorine or bromine, comprising reacting a 2,4,4,4-tetrahalogenobutyric acid chloride in the presence of an organic base with an ethylene compound which is disubstituted in 1-position by the radicals R.sub.1 and R.sub.2, as defined above, to form a 2-(2',2',2'-trihalogenoethyl)-2-halogenocyclobutan-1-one and then rearranging the latter, in the presence of a catalyst, into a 2-(2',2',2'-trihalogenoethyl)-4-halogenocyclobutan-1-one of the above formula; said 2-(2',2',2'-trihalogenoethyl)-4-halogenocyclobutan-1-ones being valuable intermediates for the preparation of 2-(2',2'-dihalogenovinyl)-cyclopropanecarboxylic acid and its insecticidally active esters; as well as the 2-(2',2',2'-trihalogenoethyl)-4-halogenocyclobutan-1-ones of the above formula and the intermediates utilized for their preparation.