Triethylamine → (2S)-2-[(1S)-5-methoxy-2,3-dihydro-1H-inden-1-yl]butanoic Acid

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Reaction Steps

A solution of the product obtained in Example 20 (105 g, 453 mmol), CIRh(PPh3)3 (21.0 g, 22.7 mmol), and Et3N (68.8 g, 679.5 mmol) in EtOH (945 mL) and THF (105 mL) was shaken in a 2-L pressure bottle under H2 (60 psi) for 16 h. The solvents were removed under reduced pressure and the residue was taken up in a mixture of HCl (1.5 L, 1 N aqueous solution) and CH2Cl2 (1.5 L) and stirred. The aqueous layer was extracted with CH2Cl2 (2×250 mL). The combined organic layers were washed with HCl (1 L, 1 N aqueous solution) and stirred with NaOH (1 L, 1 N aqueous solution). The organic layer was extracted with NaOH (2×0.5 L, 1 N aqueous solution). The combined aqueous layer was washed with CH2Cl2 (2×250 mL), and acidified (pH 2.0-3.0) by a slow addition of HCl (37% aqueous solution) while maintaining the temperature below 15° C. The acidic mixture was extracted with CH2Cl2 (2×1.5 L). The combined organic phases were washed with water (2×0.5 L) until a pH of 5.0-6.0 was reached, and brine, dried over Na2SO4, filtered, and then concentrated under reduced pressure. The product (101.0 g, 95% yield, 96.8% ee) was obtained as a light yellow oil.

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