Process for the preparation of hexahydronaphthacene derivatives
申请人:F. HOFFMANN-LA ROCHE & CO.
Aktiengesellschaft
公开号:EP0013577A2
公开(公告)日:1980-07-23
Cyclic compounds of the general formula
wherein one of R' and R2 is hydrogen and the other is hydrogen or hydroxy or R' and R2 taken together are a protected oxo group; R3 is hydrogen, hydroxy or acyloxy; R' is lower alkyl, esterified carboxy or a group of the formula -C(R5, R6) -CH2-X; R' and R'taken together are oxo or protected oxo; X is hydrogen, hydroxy, acyloxy or -(CH2)n-OY; Y is hydrogen, alkyl or acyl and n is 1 or 2; with the proviso that one of R1 and R2 is hydrogen and the other is hydroxy or R1 and R2 taken together are protected oxo when R' is acetoxy and R' is acetyl;
processes for the preparation thereof and intermediates in these processes.