| 摘要 |
<p>Process for preparing the compounds of the formula II, <IMAGE> in which R represents a group which is stable during a reductive amination, Ra denotes a group which is eliminated during an intramolecular oxazolidinone formation, in racemic or optically active form, by eliminating the isopropylidene radical from corresponding compounds of the formula III, <IMAGE> which, for their part, can be obtained by introducing the group -CORa into corresponding compounds of the formula IV <IMAGE> The compounds of the formula II are intermediates for the preparation of valuable drugs having a beta -adrenozepto-blocking effect.</p> |
