New 4-(3-(quinolin-4-yl)-3-oxopropyl)-piperidine derivatives, useful as potent, low toxicity antibacterial agents effective against Gram positive and Gram positive bacteria

摘要

1-(Substituted alkyl or propargyl)-4-((3-(6-alkoxy-quinolin-4-yl)-3-oxo-propyl)-piperidine-3-carboxylic acid, -3-acetic acid or -3-methanol derivatives (I) are new. Also new are several classes of intermediates. Quinoline derivatives of formula (I) (including isomers, enantiomers and diastereomers and their mixtures) and their salts are new. R1 = H or F; R2 = COOH, COOMe or CH2OH; R3 = (a) 1-6C alkyl substituted by -S-Ph', S-Cyc or S-Het or (b) propargyl substituted by Ph', Cyc or Het; Ph' = phenyl (optionally substituted by 1-4 of halo, OH, alkyl, alkoxy, CF3, OCF3, COOH, alkoxycarbonyl, CN or NH2); Cyc = 3-7C cycloalkyl (optionally substituted by one or more halo or CF3); Het = 5- or 6-membered heteroaryl containing 1-4 of N, O and/or S as heteroatoms (optionally substituted by one or more of halo, OH, alkyl, alkoxy, CF3, OCF3, COOH, alkoxycarbonyl, CN or NH2); and R4 = 1-6C alkyl, (2-6C) alkenyl-CH2, (2-6C) alkynyl-CH2, 3-8C cycloalkyl or (3-8C) cycloalkyl-alkyl. Independent claims are also included for: (1) Preparation of (I); and (2) Piperidine derivative intermediates of formulae (II; R1 = F) (including corresponding compounds having a protected keto function), (A; K = keto-protecting group), (B; K = keto-protecting group), (C), (VII) and (VIII). R'2 = protected COOH or protected -CH2COOH; K1 = O or keto-protecting group; Rz = amino-protecting group; Ra = 1-4C alkyl; and R'''2 = COOH or CH2COOH (both optionally protected); or CH2OH.