Water → [(4R,5R)-5-(4-methylsulfonylphenyl)-2-phenyl-4,5-dihydro-1,3-oxazol-4-yl]methanol

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Reaction Steps

(1R,2R)-2-amino-1-[4-(methylsulfonyl)phenyl]-1,3-propanediol (Compound V wherein R1 is methylsulfonyl) (about 10 g, 0.04077) is reacted at about 0° C. in a reaction vessel with benzenecarboximidic acid ethyl ester hydrochloride (Compound IV hydrochloride wherein R2 is phenyl and R4 is ethyl) (about 8.3 g, 0.0448 moles) in 1,2-dichloroethane (about 650 mL) containing triethylamine (about 4.1 g, 0.04077 moles). Next, water (about 500 mL) is added. The resulting solids are filtered, then dried to yield (4R,5R)-4,5-Dihydro-5-[4-(methylsulfonyl)phenyl]-2-phenyl-4-oxazolemethanol (Compound II wherein R1 is methylsulfonyl and R2 is phenyl).

Provenance & Evidence