abstract |
The invention provides a multistep process for preparing 1,2-diamino compounds of formula (SEE FORMULA I) wherein R1, R1', R2, R2', R3 and R4 have the meaning given in the specification and pharmaceutically acceptable addition salts thereof, from 1,2-epoxides of formula (SEE FORMULA II) wherein R1, R1', R2 and R2' have the meaning given in the specification. |