4-Phenylpyridine N-oxide (1) is used as a co-catalyst in the enantioselective epoxidation of unfunctionalized olefins using chiral (salen)manganese(III) complexes as catalysts. For example, in the presence of 1 and Jacobsenユs catalyst, epoxyindan 2 is obtained in relatively high enantioselectivity by the oxidation of indene with sodium hypochlorite. Merck's HIV protease inhibitor Crixivan® is synthesized from epoxyindan 2via chiral aminoindanol 3.1,2)
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