Acetic Acid → (3S,4aS,8aS)-N-tert-butyl-2-[(2R)-2-hydroxy-2-[(4S)-2-(3-hydroxy-2-methylphenyl)-4,5-dihydro-1,3-oxazol-4-yl]ethyl]-3,4,4a,5,6,7,8,8a-octahydro-1H-isoquinoline-3-carboxamide

Participants

Reaction Conditions

Reaction Steps

Acetic acid (14.0 ml, 245 mmol) was added to the mixture obtained in Example 8 at not more than 10° C. to make the mixture acidic, and potassium hydrogencarbonate (25.0 g, 250 mmol) and (3S, 4aS, 8aS)-decahydroisoquinoline-3-carboxylic acid t-butylamide (compound [12], 13.7 g, 57.6 mmol) were successively added. The mixture was stirred at 45° C. for 6 hours to give a pale yellow suspension. The suspension was concentrated to 1/5 and water (340 ml) was added. The suspension was stirred for one hour at room temperature. The resulting crystals were collected by filtration and washed successively with water (200 ml) and butyl acetate (340 ml). The crystals were dried under reduced pressure at 60° C. to give colorless crystals of (3S, 4aS, 8aS)-2-{(2R)-2-[(4S)-2-(3-hydroxy-2-methylphenyl)-4,5-dihydrooxazol-4-yl]-2-hydroxyethyl}decahydroisoquinoline-3-carboxylic acid t-butylamide (compound [13], 17.3 g, yield 46%, from compound [9]), melting point 240° C.

Provenance & Evidence