4-chloro-2-hydroxybenzohydrazide

Conditions: temp:130.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-chloro-2-hydroxybenzoic acid hydrazide (Chemical Abstracts, 93:7808, 475 mg, 2.55 mmol) and triethylorthoformate. (3.6 ml) is heated at 130° C. for 3.5 hours. After cooling, a precipitate formed and is collected by filtration. The filter cake is recrystallized from methanol to give 173 mg (35%) of 5-chloro-2-(1,3,4-oxadiazol-2-yl)phenol. This phenolic product is reacted with (2S)-glycidyl 3-nitrobenzenesulfonate substantially as described for Epoxide 1 to yield 170 mg (69%) of the title epoxide. After cooling a precipitate formed is collected by filtration The filter cake is recrystallized from methanol