摘要:
Hydroxyalkylating agents of formula: ##STR1## in which R denotes alkyl, n is 2 or 3, R.sub.1 denotes hydrogen or alkyl and R.sub.2 denotes alkyl an unsubstituted or substituted phenyl or ##STR2## are useful inter alia for the preparation of 1-(hydroxyalkyl)imidazoles. They are made by reaction of a sulphonic acid or dimethyl sulphate with a corresponding decarboxylate ester.
摘要:
Process for preparing 1-(hydroxyalkyl)nitroimidazoles of formula: ##STR1## which comprises reacting a sulphite or diacetate of an alkylenediol of formula:HO-(CH.sub.2).sub.n -OH (II)in the presence of a strong acid (sulphuric acid) with an imidazole derivative of formula: ##STR2## followed by hydrolizing or alcoholizing the product obtained. In the formulae (I) and (III), R denotes hydrogen or hydrocarbon. In the formulae (I) and (II), n is 2 or 3. In the formula (III), X denotes hydrogen or a radical which can be removed by hydrolysis or alcoholysis.
摘要:
Process for preparing 1-(hydroxyalkyl)nitroimidazoles of formula: ##STR1## which comprises reacting an alkylene sulphate of formula: ##STR2## with an imidazole derivative of formula: ##STR3## followed by hydrolyzing or alcoholyzing the product obtained. In the formulae (I) and (II), n is 2 or 3; in the formulae (I) and (III), R denotes hydrogen or hydrocarbon radical; and in the formula (III), X denotes hydrogen or a radical that can be removed by hydrolysis or alcoholysis.
摘要:
Hydroxyalkylating agents of formula: ##STR1## in which R denotes alkyl, n is 2 or 3, R.sub.1 denotes hydrogen or alkyl and R.sub.2 denotes alkyl an unsubstituted or substituted phenyl or ##STR2## are useful inter alia for the preparation of 1-(hydroxyalkyl)imidazoles. They are made by reaction of a sulphonic acid or dimethyl sulphate with a corresponding decarboxylate ester.
摘要:
Cyclic sulphates of formula ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6, which are identical or different, each denote hydrogen, halogen, alkyl, alkoxy, aryloxy or alkoxycarbonyl and n is 0 or 1, are prepared by rapid reaction, at a temperature of 150.degree. to 250.degree. C., of concentrated sulphuric acid with a glycol of formula ##STR2##
摘要:
Process for preparing 1-alkyl-5-nitroimidazoles of formula: ##STR1## which comprises reacting an alkyl sulphate with an imidazole derivative of general formula: ##STR2## in an organic solvent, and then hydrolyzing or alcoholyzing the product obtained. In the formulae (I) and (II), R denotes hydrogen, unsubstituted or substituted alkyl, aryl or cycloalkyl. In the formula (I), R.sub.1 denotes alkyl. In the formula (II), X denotes a group which can be removed by hydrolysis or alcoholysis.
摘要:
A process for the preparation of an aromatic ether of general formula: ##STR1## by the action of 3-chloro-1,2-propanediol sulfate on a phenol of general formula:Ar--OHin the presence of an inorganic base.Use of a product obtained according to the process for the preparation of adrenergic .beta.-blockers.
摘要:
This invention relates to a method of preparing taxane derivatives of general formula (I) by esterification of protected baccatine III or 10-deacetylbaccatine III by means of an acid of general formula (VII), elimination of protection groupings of the ester obtained, and acylation of the amine function of the side chain. In formulae (I) and (VII): Ar stands for aryl, R is hydrogen or acetyl, R.sub.1 is benzoyl or R.sub.2 -CO--O- in which R.sub.2 is alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, bicycloalkyl, phenyl or heterocyclyl, R.sub.3 and R.sub.4 may be the same or different and represent hydrogen, alkyl, alkenyl, aralkyl, aryl or alkoxy, and R.sub.5 is an alkyl radical substituted by one or more chlorine atoms (2,2,2-trichloroethyl, 2-trichloromethylisopropyl). ##STR1##
摘要翻译:本发明涉及一种通过通式(Ⅶ)的酸对保护的巴胺三醇或10-脱乙酰基浆果赤霉素III进行酯化反应制备通式(I)的紫杉烷衍生物的方法,消除得到的酯的保护基和酰化 的侧链的胺官能团。 在式(I)和(VII)中:Ar代表芳基,R是氢或乙酰基,R1是苯甲酰基或R2-CO-O-,其中R2是烷基,烯基,炔基,环烷基,环烯基,双环烷基,苯基或杂环基 R 3和R 4可以相同或不同,代表氢,烷基,烯基,芳烷基,芳基或烷氧基,R5是被一个或多个氯原子取代的烷基(2,2,2-三氯乙基,2-三氯甲基异丙基) 。
摘要:
This invention relates to a method of preparing taxane derivatives of general formula (I) by esterification of protected baccatine III or 10-deacetylbaccatine III by means of an acid of general formula (VII), elimination of protection groupings of the ester obtained, and acylation of the amine function of the side chain. In formulae (I) and (VII): Ar stands for aryl, R is hydrogen or acetyl, R.sub.1 is benzoyl or R.sub.2 --CO--O-- in which R.sub.2 is alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, bicycloalkyl, phenyl or heterocyclyl, R.sub.3 and R.sub.4 may be the same or different and represent hydrogen, alkyl, alkenyl, aralkyl, aryl or alkoxy, and R.sub.5 is an alkyl radical substituted by one or more chlorine atoms (2,2,2-trichloroethyl, (2-trichloromethylisopropyl). ##STR1##
摘要:
Disclosed is a compound of formula VII: ##STR1## where Ar represents an optionally substituted phenyl or .alpha.- or .beta.-naphthyl radical; R.sub.3 represents hydrogen, a C.sub.1-4 alkyl radical, a C.sub.2-4 alkenyl radical, an aralkyl radical, or an aryl radical; and R.sub.4 represents hydrogen, a C.sub.1-4 alkyl radical, a C.sub.2-4 alkenyl radical, an aralkyl radical, or an aryl radical; or alternatively R.sub.3 and R.sub.4, together with the carbon atom to which they are linked, form a 4- to 7-membered ring; and R.sub.5 represents an C.sub.1-4 alkyl radical substituted with at least one chlorine atom. The compound of formula VI may be used to manufacture a compound of formula VIII: ##STR2## where Ar, R.sub.3, R.sub.4 and R.sub.5 are defined above; G.sub.1 represents a group protecting the hydroxyl function; and where appropriate, G.sub.2 represents a group protecting the hydroxyl function.