摘要:
Provided is a new photochemical process for preparing artemisinin. Also provided are certain dihydroartemisinic acid derivatives useful for preparing artemisinin.
摘要:
Provided is a new photochemical process for preparing artemisinin. Also provided are certain dihydroartemisinic acid derivatives useful for preparing artemisinin.
摘要:
A process for the preparation of for the preparation of N-piperidino-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methylpyrazole-3-carboxamide and of its salts, wherein 1,5-dibromopentane is reacted with a compound of formula (IIIa) in the presence of Na2CO3 in acetonitrile heated at reflux.
摘要翻译:制备N-哌啶子基-5-(4-氯苯基)-1-(2,4-二氯苯基)-4-甲基吡唑-3-甲酰胺及其盐的方法,其中1,5-二溴戊烷 与式(IIIa)化合物在Na 2 CO 3存在下加热回流的乙腈中反应。
摘要:
The disclosure relates to compounds of formula (I): wherein R1, R2, and n are as defined in the disclosure, and addition salts solvates and hydrates thereof. The disclosure also relates to the preparation method of said compounds and to the use of the same in therapeutics.
摘要:
The invention relates to a novel process for preparing N-methylnaltrexone bromide, comprising at least the steps consisting in: (i) reacting N-methylnaltrexone methyl sulfate in aqueous solution with an alkaline agent chosen from the group constituted by sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, cesium carbonate, strontium carbonate and mixtures thereof, for a pH of the aqueous reaction medium of between 7 and 10, and then in (ii) reacting the product thus obtained with hydrobromic acid, which is added for a pH of the aqueous reaction medium of between 0.5 and 5, in order thus to obtain the N-methylnaltrexone bromide.
摘要:
The disclosure relates to derivatives of morphine-6-glucuronide of formula (I) wherein R1 is as defined in the disclosure, or an acid addition salt thereof, as well as in hydrate or solvate form. The disclosure also relates to the preparation method thereof and to the use of same in therapeutics.
摘要:
The invention relates to a novel process for preparing N-methylnaltrexone bromide, comprising at least the steps consisting in: (i) reacting N-methylnaltrexone methyl sulfate in aqueous solution with an alkaline agent chosen from the group constituted by sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, cesium carbonate, strontium carbonate and mixtures thereof, for a pH of the aqueous reaction medium of between 7 and 10, and then in (ii) reacting the product thus obtained with hydrobromic acid, which is added for a pH of the aqueous reaction medium of between 0.5 and 5, in order thus to obtain the N-methylnaltrexone bromide.
摘要:
The present invention relates to a method for the preparation of morphine compounds comprising a low content of α,β-unsaturated compounds, which comprises the steps of: (i) bringing the crude morphine compound into contact with a base, at a pH of greater than 13, under conditions which make possible the Michael addition reaction on the α,β-unsaturated compound(s) present; (ii) separating the morphine compound from the reaction mixture; and (iii) if appropriate, separating the addition product formed from the morphine compound. It also relates to a composition comprising at least 99% by dry weight of morphine compound or of a pharmaceutically acceptable salt thereof, and an α,β-unsaturated compound in a content of less than 100 ppm.
摘要:
The disclosure relates to a method for preparing morphine-6-glucuronide or one of the deritives thereof comprising reacting a compound of formula (I): wherein R1 is as defined in the disclosure, with a glucuronic acid derivative of formula (II): wherein PG, X, and R4 are as defined in the disclosure, in the presence of an aromatic solvent and trimethylsilyl trifluoromethanesulfonate; (ii) reacting the product obtained in step (i) with a strong basic agent; and then (iii) recovering the product obtained in step (ii).