Abstract
Treatment of 2,4,6-triphenylpiridinium salts, bearing a chiral β-hydroxy alkyl N-substituent with diluted aqueous sodium hydroxide afforded four new dihydrooxazolo[3,2a]pyridines,as an almost equimolar mixture of diastereomers. However, a highly selective ring closure reaction was observed for the pyridium salt derived from (1S,2S)-(+)-2-amino-1-phenyl-1,3-propanediol.
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