r-5-(?-Halogenbenzyl)-3,t-4-diaryl-c-4-hydroxy-oxazolidin-2-one als Ringtautomere von ?-(Arylaminocarbonyloxy)-?-halogen-dihydrochalkonen

Abstract

r‐5‐(α‐Halogenobenzyl)‐3, t‐4‐diaryl‐c‐4‐hydroxy‐oxazolidin‐2‐ones as Ring Tautomers of α‐(N‐Arylaminocarbonyloxy)‐β‐halogeno‐dihydrochalcones The reaction of chalcone halogenohydrins (1–3) with arylisocyanates does not stop at the stage of the α‐arylaminocarbonyloxy‐β‐halogeno‐dihydrochalcones (7), but the cyclic urethanes 4–6 are formed. Compound 7h was synthesized independently. The structure and stereochemistry of 4–6 and 7h were determined by 13C n.m.r. spectroscopy.