Patent GB-1468976-A (GB)
Title: Process for the preparation of derivatives of imidazolidine
IPC: C07D233/84
Filed: 1974-07-25
Abstract: 1468976 Imidazolidine derivatives CIBAGEIGY AG 25 July 1974 [27 July 1973 10 April 1974] 32858/74 Heading C2C Novel imidazolidine derivatives of formula and their acid addition salts, in which Het denotes a heteroaromatic radical with 5 to 6 ring members, which contains sulphur or oxygen and/or 1 to 4 nitrogen atoms as ring members, R 1  denotes an alkyl group with at most 12 carbon atoms, an alkenyl group with 3 to 5 carbon atoms, an optionally lower alkylated cycloalkyl or cycloalkenyl group with a total of at most 7 carbon atoms, or a phenylalkyl group with at most 9 carbon atoms, R 2  denotes hydrogen or the methyl or ethyl group and X denotes hydrogen, fluorine, chlorine or bromine, an alkyl group which can be interrupted by 1 or 2 oxygen or sulphur atoms and contains in total at most 7 carbon atoms, or a lower alkoxy or alkylthio group which can be interrupted by 1 or 2 oxygen or sulphur atoms and in total contains at most 7 carbon atoms, or the hydroxyl group, the amino group or an alkanamido group with at most 4 carbon atoms, and Y has the meaning of X or denotes a radical of the Formula Ia or Ib in which m denotes 2 or 3, Z denotes oxygen or sulphur, R 3  denotes hydrogen or the methyl group, R 4  denotes an alkyl or chloroalkyl group with at most 7 carbon atoms, an alkenyl group with at most 5 carbon atoms, an optionally lower alkylated cycloalkyl or cycloalkenyl group with a total of at most 8 carbon atoms, a phenyl group or a phenylalkyl or phenylalkenyl group of at most 10 carbon atoms, it being possible for the phenyl group present as R 4  or in R 4  to have from one to three substituents, or denotes an optionally methyl-substituted pyridyl, thienyl or furyl group, and of addition salts of the compounds of the general Formula I with inorganic or organic acids, characterized in that (a) a reactive functional derivative of a sulphonic acid of Formula II in which Y<SP>1</SP> has the meaning indicated for Y under the Formula I, with the exception of the radical of the Formula Ia, is reacted with a compound of Formula III or (b) a compound of Formula IV in which R 5  denotes hydrogen, an arylmethyl, diarylmethyl or triarylmethyl group, the methyl group or the allyl group is cyclized by means of a reactive cyanic acid derivative, or (c) a reactive ester of a compound of Formula V is condensed and cyclized with a compound in which formulae one of the symbols A 1  and A 2  denotes the radical R 1  and the other denotes the radical of the Formula Va or (d) a compound of Formula VII or a reactive ester of a compound of Formula VIII is condensed, and cyclized with a compound of Formula IX or an alkali metal or alkaline earth metal derivative thereof, or (e) an addition salt of Formula X is cyclized by heating or (f) if desired, a compound of the general Formula I, in which Y and optionally also X is an alkanamido group with 1 to 4 carbon atoms, or Y is a radical of the Formula Ic in which R 6  denotes hydrogen or an alkyl group with at most 4 carbon atoms, is hydrolysed to give the corresponding compound of the general Formula I, in which Y and optionally also X is an amino group, or to the corresponding compound of the general Formula XI embraced by the general Formula I or (g) if desired, a compound of the general Formula XI embraced by the general Formula I and defined above is reacted with a carboxylic acid or a dithiocarboxylic acid of the general formula R 4 -C(Z)ZH, or with a reactive functional derivative of such an acid, to give a compound of the general Formula XIII embraced by the general Formula I or indicated under the general Formula I, or (h) if desired, a compound of the general Formula I, in which X and/or Y denotes a hydroxyl group which is in the ortho-position and/ or para-position to at least one ring nitrogen atom, Het is a heteroaromatic radical, with at least one ring nitrogen atom, falling under the definition given below Formula I and R 1 , R 2  and Y and X have the meaning indicated under the Formula I, is reacted with a chloride or bromide of a mineral acid, to give a compound of Formula I in which X and/or Y is chlorine or bromine, or (i) if desired, a compound of the general Formula I, in which X and/or Y denotes a chlorine atom or a bromine atom, which is in the ortho-position and/or para-position to at least one ring nitrogen atom, Het is a heteroaromatic radical with at least one ring nitrogen atom which falls under the definition given below Formula I, is reacted with ammonia or with a metal compound of an alkanol or alkanethiol, both of which can be interrupted by 1 or 2 oxygen atoms or sulphur atoms and contain a total of at most 7 carbon atoms, and, if desired, a compound of the general Formula I, or of the general Formula XI or XIII embraced by the latter, obtained in accordance with the processes defined above, is converted into an addition salt with an inorganic or organic acid. The above novel compounds are used in pharmaceutical compositions with hypoglycaemic activity.