The Enantiomerically Pure Bicyclic b-Lactams Derived from Sugars

Abstract
Trichloroacetyl isocyanate reacts with glycals 2 and 3 under 10 kbar pressure to give (4+2) adduct 7 or 16, .beta.-lactams 8 and 9 or 17 and 18, respectively. Treatment of the post-reaction mixtures with Florisil enabled to obtain the N-unsubstituted .beta.-lactam 10 in case of products derived from 2, and 19 in case of those derived from 3.
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