Patent ES-8402271-A1 (ES)
Title: Derivatives of bicyclic amino acids, process for their preparation, agents containing them and their use, as well as bicyclic amino acids as intermediates, and process for preparing them.
IPC: C07D209/52
Filed: 1983-04-22
Abstract: 1. Claims for the Contracting states BE, CH, DE, FR, GB, IT, Li, Lu, NL, SE A compound of the formula I see diagramm : EP0084164,P21,F7 in which the hydrogen atoms on the bridgehead C atoms 3a and (6+n)a have the trans configuration relative to one another and wherein n denotes 0, 1 or 2, R1 denotes methyl, R2 denotes hydrogen, (C1 -C4 )-alkyl or benzyl, Y denotes hydrogen or hydroxyl, Z denotes hydrogen or Y and Z together denote oxygen and X denotes phenyl, and its physiologically acceptable salts. 1. Claims for the Contracting state : Austria A process for the preparation of the compounds of the formula I see diagramm : EP0084164,P24,F4 in which the hydrogen atoms on the bridgehead C atoms 3a and (6+n)a have the trans configuration relative to one another and wherein n denotes 0, 1 or 2, R1 denotes methyl, R2 denotes hydrogen, (C1 -C4 )-alkyl or benzyl, Y denotes hydrogen or hydroxyl, Z denotes hydrogen or Y and Z together denote oxygen and X denotes phenyl, and its physiologically acceptable salts, which a) comprises reacting a compound of the formula II see diagramm : EP0084164,P24,F6 wherein R1 , R2 , X, Y and Z have the meanings as in formula I, with a compound of the formula III see diagramm : EP0084164,P25,F1 in which the H atoms on the C atoms 3a and (6+n)a have the trans configuration relative to one another and wherein n denotes 0, 1 or 2 and W denotes a radical which can be cleaved off by hydrogenolysis or by acid, and subsequently splitting off the radical W and, if appropriate, the radical R2 to form the free carboxyl groups, or b) for the preparation of compounds of the formula I, in which Y and Z together denote oxygen, comprises b1 ) reacting a compound of the formula IV see diagramm : EP0084164,P25,F3 in which the H atoms on the C atoms 3a and (6+n)a have the trans configuration relative to one another and wherein n and R1 have the meanings as in formula I and W has the meaning as in formula III, with a compound of the formula V, R2 O2 C-CH = CH-CO-X wherein R2 and X have the meanings as in formula I, and subsequently splitting off the radical W and, if appropriate, also the radical R2 to form the free carboxyl groups, or, b2 ) reacting a compound of the formula IV mentioned under b1 ) with a compound of the general formula VI, wherein R2 has the meaning as in formula I, and with a compound of the general formula VII OHC-CO2 R2 X-CO-CH3 wherein X has the meaning as in formula I, subsequently splitting off the radical W and, if appropriate, the radical R2 to form the free carboxyl group, or c) for the preparation of compounds of the formula I, in which Y and Z each denote hydrogen, comprises c1 ) reacting a compound of the formula IV mentioned under b1 ) with a compound of the formula VIII see diagramm : EP0084164,P25,F2 wherein R2 and X have the meanings as in formula I, reducing the Schiff's bases obtained and subsequently splitting off the radical W and, if appropriate, the radical R2 to form the free carboxyl groups, or c2 ) catalytically reducing a compound of the formula I in which Y and Z together denote oxygen, with hydrogen, or d) for the preparation of compounds of the formula I, in which Y denotes hydroxyl and Z denotes hydrogen, comprises reducing a compound of the formula I, in which Y and Z together denote oxygen, catalytically with hydrogen or with a reducing agent, such as sodium borohydride, and, if appropriate, converting the compounds obtained according to (a)-(d) into their physiologically acceptable salts.