摘要:
The invention relates to a new process for preparing 6-amino-1,2-dihydro-1-hydroxy-2-imino-4-piperidinopyrimidine of the formula (I), ##STR1## which comprises reacting a pyrimidine derivative of the general formula (II), ##STR2## wherein R.sub.1 stantds for hydrogen or a ##STR3## group, wherein R means a C.sub.1-6 alkyl group or an aryl group optionally substituted by halogen;R.sub.2 stands for a hydroxyl group or an ##STR4## group, wherein R is as defined above; andX represents chlorine or bromine or an optionally mono- or polysubstituted arenesulfonyloxy group,with the proviso that R.sub.2 is different from a hydroxyl group when R.sub.1 stands for hydrogen, with piperidine and hydrolyzing, optionally after isolation, the thus-obtained 4-piperidino derivative of the general formula (III), ##STR5## wherein R.sub.1 and R.sub.2 are as defined above.
摘要:
Anti-Fungal compounds are disclosed of the Formula (I) ##STR1## wherein R.sup.1 is C.sub.1 to C.sub.10 alkyl, phenyl, or phenyl-C.sub.1 to C.sub.6 alkyl, and the phenyl moiety of the two latter groups may carry at least one substituent selected from the group consisting of a halogen atom, C.sub.1 to C.sub.6 alkoxy group, phenyl group, phenoxy group, and trifluorome thyl group; R.sup.2 is a hydrogen atom, a C.sub.1 to C.sub.10 alkyl group or a phenyl group; R.sup.3 and R.sup.4 are independently from each other a C.sub.1 to C.sub.10 alkyl group or a phenyl group; X is a hydrogen atom, halogen atom or a group of the formula (A) ##STR2## and in this formula Y.sup.1 and Y.sup.2 are independently from each other, a --N.dbd. atom or a group of the formula --CH.dbd., or an optical antipode thereof.
摘要:
A process is disclosed for the preparation of racemic cis or trans apovincaminic acid esters of the formula (I) ##STR1## and the corresponding optically active derivatives of the formulae (Ia) ##STR2## wherein R.sup.1 and R.sup.2 are identical or different alkyl groups having 1 to 6 carbon atoms. Apovincaminic acid alkyl esters are well-known vasodilating compounds.
摘要:
The invention relates to a new process for the preparation of apovincaminic acid esters. More particularly, the invention concerns a process for preparing racemic and optionally active vincaminic acid esters of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 independently stand for alkyl having from one to 6 carbon atoms, and 14-epimers thereof.According to the invention an octahydroindolo[2,3-a]quinolizine-oxime ester of the formula (II) ##STR2## in which R.sup.1 and R.sup.2 have the same meaning as defined above, is reacted with an aqueous solution of sulfurous acid or a salt thereof at a temperature of 80.degree. to 110.degree. C. and the 14-epimeric mixture obtained is epimerized or separated in a known manner and if desired, the racemic vincaminic acid esters are resolved.The valuable, pharmaceutically active compounds of the formula (I) can be prepared according to the invention in a considerably improved yield and the undesired side reactions can be suppressed and/or the by-products can easily be converted into other pharmaceutically active materials.
摘要:
The invention relates to new eburnane derivatives of the formula (I) ##STR1## wherein R.sup.1 is alkyl having from 1 to 6 carbon atoms, and acid addition salts thereof.The invention further relates to a process for the preparation of these compounds and pharmaceutical compositions containing them.Compounds of formula (I) show remarkable CNS-activity and are useful intermediates in the preparation of other, pharmaceutically active compounds.
摘要:
The invention relates to a new process for the preparation of eburnamonine derivatives of the general Formula I ##STR1## (wherein R.sup.1 is an alkyl group having 1-6 carbon atoms) and optical and geometrical isomers thereof which comprises reacting a hydroxyimino-octahydro-indolo[2,3-a]quinolizine derivative of the general Formula II ##STR2## (wherein R.sup.1 is as stated above and R.sup.2 stands for an alkyl group having 1-6 carbon atoms being identical with or different from R.sup.1, or a hydrogen atom) or an acid addition salt thereof in an organic protic solvent or solvent mixture with an inorganic base, optionally under the addition of water or an aqueous mineral acid, at a temperature between 60.degree. C. and 200.degree. C.The compounds of the present invention are known drugs having blood pressure decreasing and cerebral vasodilatatory effect. The advantage of the process of the present invention is that it is readily feasible on industrial scale too, provides isomer-free pure products with high yield and requires the use of readily available simple starting materials.
摘要:
Novel 2-hydroxyimino-1,2,3,4,6,7-hexahydro-11bH-benzo [a] quinolisine derivatives are prepared by reacting substituted 2-oxo-benzo[a]quinolisine compounds with hydroxylamine or an acid addition salt thereof. The described compounds and their acid addition salts and quaternary onium derivatives evidence psychopharmacological properties in the absence of adverse side effects.
摘要:
The invention relates to new indolo-quinolizidine derivatives of the general formula (I) or salts or optically active isomers thereof, ##STR1## wherein R stands for an alkyl group, AND PHARMACEUTICAL COMPOSITIONS CONTAINING THE SAME, AS WELL AS TO A PROCESS FOR THE PREPARATION THEREOF.The new compounds according to the invention possess vasodilatating and hypotensive effects and can be used in the therapy as medicines. The new compounds according to the invention are completely devoid of harmful side-effects.
摘要:
The invention relates to a new enantioselective synthesis for the preparation of optically active 14-oxo-E-homo-eburnane derivatives of the formula (Ia) ##STR1## wherein R.sup.1 is alkyl having from 1 to 4 carbon atom. In the synthesis optically active 6-alkoxycarbonylhexahydroindoloquinolizinium salts are employed as starting materials, which contain a center of chirality at the site of attachment of the carboxyl group. This center of chirality preserves the optical activity of the optically active tryptophan ester from which this compound has been prepared until a new center of chirality is formed in the molecule in a configuration corresponding to the desired end product. The carboxyl group, which is not needed in the end product and only serves to preserving the optical activity can then be eliminated.Compounds of the formula (Ia) are known in the art and may be used in the synthesis of (+)-vincamine and (+)-apovincaminic acid ethylester.
摘要:
A novel process for preparing 11-bromo-vincaminic acid esters of the general formula ##STR1## wherein R.sup.1 and R.sup.2 each stand independently from each other for a C.sub.1-6 alkyl group, comprising the steps of treating a 1-alkyl-1-alkoxycarbonylethyl-octahydroindolo-quinolisine of the general formula ##STR2## wherein R.sup.2 is as defined above and R.sup.3 stands for a C.sub.1-6 alkyl group, with a brominating agent and treating the resulting isomeric mixture of the bromo-derivatives with an alkaline agent or treating the corresponding 14-oxo-E-homo-eburnane being unsubstituted in ring A with a brominating agent and nitrosating the resulting 11-bromo-14-oxo-E-homo-eburnane of the general formula ##STR3## wherein R.sup.2 is as defined above, then subjecting the resulting 11-bromo-14-oxo-15-hydroxyimino-E-homoeburnanes to deoxyimination and treating the 14,15-dioxo-derivatives obtained with a base in an alcohol of the general formula R.sup.1 OH, wherein R.sup.1 is as defined above.All the intermediate products are novel and exhibit a therapeutical protecting effect against cerebral hypoxy.