| abstract |
Process for preparing piperidine derivatives of the general formula ** (Formula) ** wherein R represents a halogen atom or a hydroxy, lower alkoxy, lower alkenyloxy, lower alkynyloxy or aralkyloxy group or a lower acyloxy group in which the acyl group is derived from a carboxylic acid; R1 represents a hydrogen atom or an amino, lower alkylamino, dialkylamino or a lower acylamino group in which the acyl group is derived from a carboxylic acid; R2 represents a nitro, trifluoromothyl or lower alkylthio group or Rl and R2 together form a triazo group (ie -HN-N = N-); R3 represents a hydrogen atom or a lower alkyl or lower alkenyl, or a cycloalkyl or cycloalkenyl group having 3 to 7 carbon atoms in the ring, or a phenyl group, R4 represents a cycloalkenyl group having 3 to 7 carbon atoms on the ring, optionally substituted by a lower alkyl or lower alkenyl group; R5, R6 and R7 each represent a hydrogen atom, a lower alkyl, lower alkenyl or a benzyl group, and W represents a single bond or a lower alkylene or lower alkenylene group. |