cycloaddition of sorbic aldehyde derivative 9 and of sorbic acid 10 with the chiral chloro-nitroso dienophile 7 led with excellent regio- and diastereoselectivity to the chiral cycloadducts 11a and 12, respectively. Catalytic osmylation of their Bzl-derivatives 11b and 13b, followed by reductive cleavage of the NO bonds, gave ultimately the chiral aminoallose derivatives D-5 and D-6 which are potential