Abstract
The photolytic reaction of chromium-alkoxycarbene complexes with valine-derived, optically active thiazolines produced optically active β-lactam penam derivatives in fair to good yield and with high diastereoselectivity. In most cases alcoholosis of the β-lactam followed by solvolysis of the thiazolidine ring produced optically active quaternary centers having carbon substituents in four different oxidation states-alkane, alkoxy, aldehyde, and ester
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