Abstract: A cyclopenta[g]quinazoline derivative, containing an L-Glu-?-D-Glu dipeptide group, of formula (I): wherein R1 is amino, C1-4 hydroxyalkyl, C1-4 fluoroalkyl or methoxy-C1-4-alkyl; R2 is hydrogen, C1-4 alkyl, C3-4 alkenyl, C3-4 alkynyl, C2-4 hydroxyalkyl C2-4 halogenoalkyl or C1-4 cyanoalkyl; and Ar is phenylene, thiophenediyl, thiazolediyl, pyridinediyl or pyrimidinediyl which may optionally bear one or two substituents selected from halogeno, hydroxy, amino, nitro, cyano, trifluoromethyl, C1-4 alkyl and C1-4 alkoxy, the compound (I) optionally being in the form of a pharmaceutically acceptable salt or ester; may be used for the treatment of rheumatoid arthritis or acute myeloid leukaemia.

Abstract: A cyclopenta[g]quinazoline derivative, containing an L-Glu-?-D-Glu dipeptide group, of formula (I): wherein R1 is amino, C1-4 hydroxyalkyl, C1-4 fluoroalkyl or methoxy-C1-4-alkyl; R2 is hydrogen, C1-4 alkyl, C3-4 alkenyl, C3-4 alkynyl, C2-4 hydroxyalkyl C2-4 halogenoalkyl or C1-4 cyanoalkyl; and Ar is phenylene, thiophenediyl, thiazolediyl, pyridinediyl or pyrimidinediyl which may optionally bear one or two substituents selected from halogeno, hydroxy, amino, nitro, cyano, trifluoromethyl, C1-4 alkyl and C1-4 alkoxy, the compound (I) optionally being in the form of a pharmaceutically acceptable salt or ester; may be used for the treatment of rheumatoid arthritis or acute myeloid leukaemia.

Abstract: Cyclopenta[g]quinazolines of the formula (I): wherein: A is a group OR or NR0R1 wherein R0 and R1 are each independently hydrogen C1-4 alkyl, C3-4 alkenyl, C3-4 alkynyl, C2-4 hydroxyalkyl, C2-4 halogenoalkyl or C1-4 cyanalkyl, or R0 and R1 together with the intermediate N form a five- or six-membered heterocyclic ring; p is an integer in the range 1 to 4; R2 is hydrogen, C1-4 alkyl, C3-4 alkenyl, C3-4 alkynyl, C2-4 hydroxyalkyl, C2-4 halogenoalkyl or C1-4 cyanoalkyl; Ar1 is phenylene, thiophenediyl, thiazolediyl, pyridinediyl or pyrimidinediyl which may optionally bear one or two substituents selected from halogeno, hydroxy, amino, nitro, cyano, trifluoromethyl, C1-4 alkyl and C1-4 alkoxy; and R3 is a group of one of the following formulae: -A1-Ar2-A2-Y1-A5-CON(R)CH(Y4)Y5-A8-X-Ar4 and pharmaceutically acceptable salts or esters thereof are of therapeutic value particularly in the treatment of cancer.

Abstract: Cyclopenta[g]quinazolines of the formula (I): wherein; A is hydrogen or a group OR or NR0R1 wherein R0 and R1 are each independently hydrogen C1-4 alkyl, C1-4 alkenyl, C1-4 alkynyl, C2-4 hydroxyalkyl, C1-4 halogenoalkyl or C1-4 cyanoalkyl, or R0 and R1 together with the intermediate N form a five- or six-membered heterocyclic ring, p is an integer in the range 1 to 4; R2 is hydrogen, C1-4 alkyl, C3-4 alkenyl, C3-4 alkynyl, C2-4 hydroxyalkyl, C2-4 halogenoalkyl or C1-4 cyanoalkyl; Ar1 is phenylene, thiophenediyl, thiazolediyl, pyridinediyl or pyrimidinediy which may optionally bear one or two subtituents selected from halogeno, hydroxy, amino, nitro, cyano, trifluoromethyl, C1-4 alkyl and C1-4 alkoxy; and R3 is a group the following formula: (II) and pharmaceutically acceptable salts or calers may be used in the treatment of solid tumours.

Abstract: Dihydroquinazoline derivatives of the formula where R3 is —(CH2)p—A where p is from 1 to 4 and A is a 5- or 6-membered N-containing heterocyclic ring attached via the N atom or A is —NA′A″ wherein A′ and A″ are the same or different and are each a C1-C4 alkyl group or their pharmaceutically acceptable salts possessing anti-cancer activity.