Abstract: 3-substituted tetrahydropyridopyrimidinone derivatives of the formula (I) wherein the radicals have the meanings given in the Description, to a method for producing said derivatives and, to their use for producing active ingredients for drugs.

Abstract: 3-Substituted 3,4,5,7-tetrahydropyrrolo[3′,4′:4,5]thieno-[2,3-d]pyrimidine derivatives of the formula I in which the substituents have the meanings stated in the description, their preparation and their use as drugs.

Abstract: where the substituents have the meanings indicated in the description, their preparation and use as serotonin antagonists.

Abstract: 3-Substituted 3,4,5,6,7,8-hexahydropyrido [3',4':4,5]-thieno[2,3-d]pyrimidine derivatives of the formula I ##STR1## where R.sup.1 is a hydrogen atom, a C.sub.1 -C.sub.4 -alkyl group, an acetyl group, a phenylalkyl C.sub.1 -C.sub.4 radical, the aromatic system being unsubstituted or substituted by halogen, C.sub.1 -C.sub.4 -alkyl, trifluoromethyl, hydroxyl, C.sub.1 -C.sub.4 -alkoxy, amino, cyano or nitro groups, or is a phenylalkanone radical, it being possible for the phenyl group to be substituted by halogen,R.sup.2 is a phenyl, pyridyl, pyrimidinyl or pyrazinyl group which is unsubstituted or mono- or disubstituted by halogen atoms, C.sub.1 -C.sub.4 -alkyl, trifluoromethyl, trifluoromethoxy, hydroxyl, C.sub.1 -C.sub.4 -alkoxy, amino, monomethylamino, dimethylamino, cyano or nitro groups and which may be fused to a benzene nucleus which can be unsubstituted or mono- or disubstituted by halogen atoms, C.sub.1 -C.sub.4 -alkyl, hydroxyl, trifluoromethyl, C.sub.1 -C.sub.

Abstract: 3-Substituted 3,4-dihydrothieno[2,3-d]pyrimidine derivatives of the formula I ##STR1## where R.sup.1 and R.sup.2 are a hydrogen atom or a C.sub.1 -C.sub.4 -alkyl group,R.sup.3 is a phenyl, pyridyl, pyrimidinyl or pyrazinyl group which is unsubstituted or mono- or disubstituted by halogen atoms, C.sub.1 -C.sub.4 -alkyl, trifluoromethyl, trifluoromethoxy, hydroxyl, C.sub.1 -C.sub.4 -alkoxy, amino, monomethylamino, dimethylamino, cyano or nitro groups and which may be fused to a benzene nucleus which may be unsubstituted or mono- or disubstituted by halogen atoms, C.sub.1 -C.sub.4 -alkyl, hydroxyl, trifluoromethyl, C.sub.1 -C.sub.4 -alkoxy, amino, cyano or nitro groups, and may contain 1 nitrogen atom, or to a 5- or 6-membered ring, which may contain 1-2 oxygen atoms,A is NH or an oxygen atom,Y is CH.sub.2, CH.sub.2 --CH.sub.2, CH.sub.2 --CH.sub.2 --CH.sub.2 or CH.sub.