Water → (3S,4aS,8aS)-2-[(2R, 3R)-3-(3-acetoxy-2-methylbenzoylamino)-2-hydroxy-4-phenylthiobutyl]decahydroisoquinoline-3-carboxylic acid t-butylamide

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Reaction Steps

(3S, 4aS, 8aS)-2-((2R, 3R)-3-Amino-2-hydroxy-4-phenylthiobutyl)-decahydroisoquinoline-3-carboxylic acid t-butylamide (compound [14], 9.39 g) and sodium hydrogencarbonate (4.55 g, 54.2 mmol) were added to a suspension of water (40 ml) and ethyl acetate (40 ml). A solution of 3-acetoxy-2-methylbenzoyl chloride (4.37 g, 20.6 mmol) in ethyl acetate (40 ml) was dropwise added to the suspension with stirring under ice-cooling. The mixture was further stirred for one hour under ice-cooling and water (20 ml) was added. The organic layer was separated and washed with a saturated aqueous solution (20 ml) of sodium hydrogencarbonate. After drying over magnesium sulfate, the solvent was distilled away under reduced pressure to give (3S, 4aS, 8aS)-2-[(2R, 3R)-3-(3-acetoxy-2-methylbenzoylamino)-2-hydroxy-4-phenylthiobutyl]decahydroisoquinoline-3-carboxylic acid t-butylamide (12.7 g, yield 96%) as colorless amorphous. 1H-NMR (CDCl3, 300 MHz) δ: 7.5-7.1 (m,8H), 7.1-7.0 (m,1H), 5.51 (brd.s,1H), 4.48 (m,1H), 4.07 (m,1H), 3.81 (dd,J=13.7,9.2Hz,1H), 3.41 (dd,J=13.7,4.7Hz,1H), 2.91 (dd,J=11.7,2.0Hz,1H), 2.56 (dd, J=12.9,9.1Hz,1H), 2.44 (m,1H), 2.32 (s,3H), 2.27 (s,3H), 2.3-2.1 (m,2H), 1.99 (m,1H), 1.9-1.1 (m,11H), 1.07 (s,9H)

Provenance & Evidence