PROCESS FOR THE PREPARATION OF N- (METHOXYMETHYLEFPROCEDE FOR THE PREPARATION OF N- (METHOXYMETHYLFURYLMETHYLE) -6,7-BENZOMORPHANES-MORPHINANES URYLMETHYLE) -6,7-BENZOMORPHANES-MORPHINANES

摘要

Compound of the formula WHEREIN R1 and R2, which may be identical to or different from each other, are each hydrogen or alkyl of 1 to 3 carbon atoms, R3 is hydrogen or methyl, R4 is R5 is hydrogen, methyl or acetyl, AND NON-TOXIC, PHARMACOLOGICALLY ACCEPTABLE ACID ADDITION SALTS THEREOF; THE COMPOUNDS AS WELL AS THEIR SALTS ARE USEFUL AS ANALGESICS.