Efficient enzymatic resolutions at two stages of our route from benzene to amino(deoxy)inositols (rac-11a,b; 12a,b; 13a,b) and highly selective enzymatic asymmetrizations of meso-precursors (16d; 18a,b; 21b) on the way from tropilidene to diaminotetradeoxyheptitols provide enantiomerically pure (highly enriched) aminoglycoside building blocks.