Stereopopulation control. VII. Rate enhancement in the lactonization of 3-(o-hydroxyphenyl)propionic acids: dependence on the size of aromatic ring substituents
Stereopopulation control. VII. Rate enhancement in the lactonization of 3-(o-hydroxyphenyl)propionic acids: dependence on the size of aromatic ring substituents
The invention concerns anti-tumour agents of formula (I) wherein each of R1, R2 and R3 has the meanings defined in the specification including hydrogen, (1-4C)alkyl, (3-4)alkenyl, (3-4C)alkynyl, amino, (1-4C)alkylamino and (1-4C)alkoxy; each of R4 and R5 is (1-4C)alkyl; each of R6 and R7 is hydrogen or (1-4C)alkyl; X is oxygen; m is 1 or 2 and each R8 is as defined in the specification; each of Y1 and Y2 is halogeno, (1-4C)alkanesulphonyloxy, benzenesulphonyloxy or phenyl-(1-4C)akanesulphonyloxy; or a pharmaceutically-acceptable salt thereof; provided that at least one of R1, R2 and R3 is other than hydrogen; a process for preparation, pharmaceutical compositions containing them and their use in the production of an anti-proliferative effect.
The invention concerns anti-tumor agents of formula (I), wherein each of R1, R2 and R3 has the meanings defined in the specification including hydrogen, (1-4C)alkyl, (3-4C)alkynyl and (1-4C)alkoxyl; each of R4 and R5 is (1-4C) alkyl; each of R6 and R7 is hydrogen or (1-4C)alkyl; X is N-(1-4C)alkylimino, N-(3-4C)alkenylimino, or (3-4C)alkynylimino; m is 1 or 2 and each R8 is as defined in the specification; each Y′ and Y2 is halogen, (1-4C)alkanesulphonyloxy, benzensulphonyloxy or phenyl-(1-4C)alkanesulfonyloxy; or a pharmaceutical acceptable salt thereof; provided that at least one of R1, R2 and R3 is other than hydrogen; a process for their preparation, pharmaceutical composition containing them and their use for producing an anti-proliferative effect in a warm-blooded animal.