摘要:
The invention relates to a process for the synthesis of a polyisocyanate composition comprising acylureas. According to the invention, a starting composition comprising a compound having at least two isocyanate functional groups is subjected to a reaction with at least two acid functional groups, with at least one of the acid functional groups having a pKa value of less than or equal to 3, and at least one of the acid functional groups having a pKa value of more than 3 and less than or equal to 6, at a temperature at least equal to 50 ° C., wherein the acid functional group having a pKa value of less than or equal to 3 and the acid functional group having a pKa value of more than 3 and less than or equal to 6 are present on two different acids or on the same acid.
摘要:
A method of N-alkoxyalkylating ureides according to the invention comprises reacting a ureide of structure I ##STR1## with an alkylating agent of structure III ##STR2## in the presence of a basic catalyst in an aprotic reaction medium. The ureide may be a 5,5-disubstituted barbituric acid, or it may be phenytoin, glutethimide, and ethosuximide. The alkylating agent is an ester of a sulfonic acid. The base may be a hydride or amine. A preferred process comprises N-alkoxyalkylating 5,5-diphenyl-barbituric acid with methoxymethyl methanesulfonate in the presence of di-isopropyl ethyl amine and isolating the resultant N,N'-bismethoxymethyl-5,5-diphenyl-barbituric acid. The invention also contemplates the novel compounds N-methoxymethyl-5,5-diphenylbarbituric acid, N-methoxymethyl ethosuximide, and N-methoxymethyl glutethimide, and a method comprising administering them to a patient.
摘要:
The invention relates to N-benzoylureidocinnamic acid derivatives and to their physiologically tolerated salts and physiologically functional derivatives. The invention thus relates to compounds of formula I, 1 in which the radicals have the given meanings, and to their physiologically tolerated salts and processes for preparing them. The compounds are, for example, suitable for use as antidiabetic agents.
摘要:
A method of N-alkoxyalkylating ureides according to the invention comprises reacting a ureide of structure I: with an alkylating agent of structure III: in the presence of a basic catalyst in an aprotic reaction medium. The ureide may be a 5,5-disubstituted barbituric acid, or it may be phenytoin, glutethimide, and ethosuximide. The alkylating agent is an ester of a sulfonic acid. The base may be a hydride or amine. A preferred process comprises N-alkoxyalkylating 5,5-diphenyl-barbituric acid with methoxymethyl methanesulfonate in the presence of di-isopropyl ethyl amine and isolating the resultant N,N′-bismethoxymethyl-5,5-diphenyl-barbituric acid. The invention also contemplates the novel compounds N-methoxymethyl-5,5-diphenylbarbituric acid, N-methoxymethyl ethosuximide, and N-methoxymethyl glutethimide, and a method comprising administering them to a patient.
摘要:
The present invention is concerned with a process for producing biuret polyisocyanates and the polyisocyanates so produced. These isocyanates are produced by the reaction of at least about a four fold molar excess of a diisocyanate having aliphatically bound isocyanate groups with amino alcohols having a particular structure at a temperature between about 90 and 200.degree. C. The amino alcohols contain at least three carbon atoms, have their hydroxyl and amino groups separated by at least two carbon atoms, and may contain urea, urethane, ether or amino bonds. The present invention is also concerned with a process for producing two component and one component moisture curing lacquers using the biuret polyisocyanates of the present invention and the lacquers so produced.
摘要:
A class of glycyl urea derivatives is described having use in treatment of CNS dysfunctions such as epilepsy and convulsive disorders. Compounds of interest are those of the formula ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is a group independently selected from hydrido, alkyl, aralkyl, aryloxyalkyl and arylthioalkyl, any one of which groups having a substitutable position may be substituted with one or more radicals selected from halo, alkyl of one to about ten carbon atoms, alkenyl of two to about ten carbon atoms, alkynyl of two to about ten carbon atoms, haloalkyl, alkoxy, alkylthio, alkylsulfinyl and alkylsulfonyl; or a pharmaceutically-acceptable salt thereof; with the proviso that when each of R.sup.1 and R.sup.2 is ethyl, then R.sup.3 and R.sup.4 cannot be hydrido simultaneously.