A process for obtaining the compound of the formula I in which R1 is 1) a hydrogen atom, 2) -(C 1 -C 12)-alkyl, 3) -(C 6 -C 14)-aryl, 4) -(C 3 -C 8)-cycloalkyl or 5) a 4- to 15-membered Het ring, R2 and R3 are the same or different and are each independently 1) a hydrogen atom, 2) (C 1 -C 12)-alkyl, 3) -(C 6 -C 14)-aryl where aryl is unsubstituted or mono-, di- or trisubstituted by -(C 1 - 6)-alkyl, 4) -(C 3 -C 8)-cycloalkyl or 5) a 4- to 15-membered Het ring, P is a hydrogen atom, which comprises a) reacting a boronoindole of the formula IV in which R1 is as defined in formula I, R4 and R5 are the same or different and are each independently 1) -OH, 2) -O-(C 1 -C 12)-alkyl, 3) -O-(C 6 -C 14)-aryl, 4) -O-(C 3 - 8)-cycloalkyl, 5) -(C 1 -C 12)-alkyl or 6) -O-Het, where Het is a 4- to 15-membered Het ring, or R4 and R5, together with the boron atom to which they are bonded, form a ring having 4, 5, 6 or 7 carbon atoms in the ring and the ring may, instead of the particular carbon atoms, contain two oxygen atoms or two oxygen atoms and one nitrogen atom, P is a hydrogen atom, with an aminopyrimidine of the formula V in which R2 and R3 are each as defined in formula I and X is 1) halogen, 2) -O-SO 2 -R2 or 3) -O-C -R2, or b) reacting a boronoindole of the formula IV with a pyrimidine of the formula VI in which X is as defined in formula V and Y is 1) halogen, 2) -O-SO 2 -R2, or 3) -O-C -R2 to give a compound of the formula VII in which R1 and P are each as defined in formula IV and Y is as defined in the compound of the formula VI, and then reacting the compound of the formula VII with an amine of the formula VIII in which R2 and R3 are each as defined in formula I, and c) either isolating the compound of the formula I prepared by processes a) or b) in free form or, in the case of the presence of acidic or basic groups, converting it to physiologically compatible salts. R1 is 1) a hydrogen atom, 2) -(C 1 -C 12)-alkyl, 3) -(C 6 -C 14)-aryl, 4) -(C 3 -C 8)-cycloalkyl or 5) a 4- to 15-membered Het ring, 1) a hydrogen atom, 2) -(C 1 -C 12)-alkyl, 3) -(C 6 -C 14)-aryl, 4) -(C 3 -C 8)-cycloalkyl or 5) a 4- to 15-membered Het ring, R2 and R3 are the same or different and are each independently 1) a hydrogen atom, 2) (C 1 -C 12)-alkyl, 3) -(C 6 -C 14)-aryl where aryl is unsubstituted or mono-, di- or trisubstituted by -(C 1 - 6)-alkyl, 4) -(C 3 -C 8)-cycloalkyl or 5) a 4- to 15-membered Het ring, 1) a hydrogen atom, 2) (C 1 -C 12)-alkyl, 3) -(C 6 -C 14)-aryl where aryl is unsubstituted or mono-, di- or trisubstituted by -(C 1 - 6)-alkyl, 4) -(C 3 -C 8)-cycloalkyl or 5) a 4- to 15-membered Het ring, P is a hydrogen atom, a) reacting a boronoindole of the formula IV in which R1 is as defined in formula I, R4 and R5 are the same or different and are each independently 1) -OH, 2) -O-(C 1 -C 12)-alkyl, 3) -O-(C 6 -C 14)-aryl, 4) -O-(C 3 - 8)-cycloalkyl, 5) -(C 1 -C 12)-alkyl or 6) -O-Het, where Het is a 4- to 15-membered Het ring, or R4 and R5, together with the boron atom to which they are bonded, form a ring having 4, 5, 6 or 7 carbon atoms in the ring and the ring may, instead of the particular carbon atoms, contain two oxygen atoms or two oxygen atoms and one nitrogen atom, P is a hydrogen atom, with an aminopyrimidine of the formula V in which R2 and R3 are each as defined in formula I and X is 1) halogen, 2) -O-SO 2 -R2 or 3) -O-C -R2, or in which R1 is as defined in formula I, R4 and R5 are the same or different and are each independently 1) -OH, 2) -O-(C 1 -C 12)-alkyl, 3) -O-(C 6 -C 14)-aryl, 4) -O-(C 3 - 8)-cycloalkyl, 5) -(C 1 -C 12)-alkyl or 6) -O-Het, where Het is a 4- to 15-membered Het ring, or 1) -OH, 2) -O-(C 1 -C 12)-alkyl, 3) -O-(C 6 -C 14)-aryl, 4) -O-(C 3 - 8)-cycloalkyl, 5) -(C 1 -C 12)-alkyl or 6) -O-Het, where Het is a 4- to 15-membered Het ring, R4 and R5, together with the boron atom to which they are bonded, form a ring having 4, 5, 6 or 7 carbon atoms in the ring and the ring may, instead of the particular carbon atoms, contain two oxygen atoms or two oxygen atoms and one nitrogen atom, P is a hydrogen atom, 1) halogen, 2) -O-SO 2 -R2 or 3) -O-C -R2, b) reacting a boronoindole of the formula IV with a pyrimidine of the formula VI in which X is as defined in formula V and Y is 1) halogen, 2) -O-SO 2 -R2, or 3) -O-C -R2 to give a compound of the formula VII in which R1 and P are each as defined in formula IV and Y is as defined in the compound of the formula VI, and then reacting the compound of the formula VII with an amine of the formula VIII in which R2 and R3 are each as defined in formula I, and 1) halogen, 2) -O-SO 2 -R2, or 3) -O-C -R2 c) either isolating the compound of the formula I prepared by processes a) or b) in free form or, in the case of the presence of acidic or basic groups, converting it to physiologically compatible salts.