r-5-(?-Halogenbenzyl)-3,t-4-diaryl-c-4-hydroxy-oxazolidin-2-one als Ringtautomere von ?-(Arylaminocarbonyloxy)-?-halogen-dihydrochalkonen
摘要:
The reaction of chalcone halogenohydrins (1-3) with arylisocyanates does not stop at the stage of the alpha-arylaminocarbonyloxy-beta-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 C-13 n.m.r. spectroscopy.